900 (number)

Nine hundred is the natural number following eight hundred ninety-nine and preceding nine hundred one. It is the square of 30 and the sum of Euler's totient function for the first 54 integers. In base 10 it is a Harshad number.


Ordinal	Nine hundred
Cardinal	900th
Factorization	$2^2 \cdot 3^2 \cdot 5^2$
Roman numeral	CM
Binary	1110000100
Hexadecimal	384

Nine hundred is also:

The telephone area code for "premium" phone calls in the North American Numbering Plan: see 900 number.
In Greek number symbols Sampi ("Great Pi" ostensibly from the visual resemblance to the Greek letter), which is signified by a convex horizontal arc with two parallel vertical lines below. Sometimes represented in a slightly tilted form.
A skateboarding trick in which the skateboarder spins two and a half times (360 degrees times 2.5 is 900)
For the year AD, see 900.

901 = 17 × 53

902 = 2 × 11 × 41, sphenic number, nontotient, Harshad number, also the telephone area code for Nova Scotia and Prince Edward Island

903 = 3 × 7 × 43, sphenic number, triangular number, Mertens function(903) returns 0

904 = 2³ × 113 or 113x8, Mertens function(904) returns 0

905 = 5 × 181, sum of seven consecutive primes (109 + 113 + 127 + 131 + 137 + 139 + 149)

906 = 2 × 3 × 151, sphenic number, Mertens function(906) returns 0

907 prime number, also the telephone area code for Alaska

908 = 2² × 227, nontotient

909 = 3² × 101

910 = 2 × 5 × 7 × 13, Mertens function(910) returns 0, Harshad number

911 has its own page

912 = 2⁴ × 3 × 19, sum of four consecutive primes (223 + 227 + 229 + 233), sum of ten consecutive primes (67 + 73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109), Harshad number. In the Stonecutters episode of The Simpsons, Lenny told Homer the real emergency number is 912.

913 = 11 × 83, Smith number, Mertens function(913) returns 0. After escaping the Jedi purge, Obi-Wan Kenobi transmitted a 913 emergency transmission.

914 = 2 × 457, nontotient

915 = 3 × 5 × 61, sphenic number, Smith number, Mertens function(915) returns 0, Harshad number

916 = 2² × 229, Mertens function(916) returns 0, nontotient

917 = 7 × 131, sum of five consecutive primes (173 + 179 + 181 + 191 + 193)

918 = 2 × 3³ × 17, Harshad number

919 prime number, cuban prime, Chen prime, palindromic prime, centered hexagonal number, Mertens function(919) returns 0

920 = 2³ × 5 × 23, Mertens function(920) returns 0

921 = 3 × 307

922 = 2 × 461, nontotient, Smith number

923 = 13 × 71

924 = 2² × 3 × 7 × 11, sum of a twin prime (461 + 463)

925 = 5² × 37, centered square number, the millesimal fineness number for Sterling silver

926 = 2 × 463, sum of six consecutive primes (139 + 149 + 151 + 157 + 163 + 167), nontotient

927 = 3² × 103, tribonacci number

928 = 2⁵ × 29, sum of four consecutive primes (227 + 229 + 233 + 239), sum of eight consecutive primes (101 + 103 + 107 + 109 + 113 + 127 + 131 + 137)

929 prime number, palindromic prime, sum of nine consecutive primes (83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 + 127), Eisenstein prime with no imaginary part

930 = 2 × 3 × 5 × 31, pronic number

931 = 7² × 19, sum of three consecutive primes (307 + 311 + 313)

932 = 2² × 233

933 = 3 × 311

934 = 2 × 467, nontotient

935 = 5 × 11 × 17, sphenic number, Harshad number

936 = 2³ × 3² × 13, pentagonal pyramidal number, Harshad number

937 prime number, Chen prime, star number

938 = 2 × 7 × 67, sphenic number, nontotient

939 = 3 × 313

940 = 2² × 5 × 47, totient sum for first 55 integers

941 prime number, sum of three consecutive primes (311 + 313 + 317), sum of five consecutive primes (179 + 181 + 191 + 193 + 197), Chen prime, Eisenstein prime with no imaginary part

942 = 2 × 3 × 157, sphenic number, sum of four consecutive primes (229 + 233 + 239 + 241), nontotient

943 = 23 × 41

944 = 2⁴ × 59, nontotient

945 = 3³ × 5 × 7, double factorial of 9, smallest odd abundant number (divisors less than itself add up to 975), Leyland number

946 = 2 × 11 × 43, sphenic number, triangular number, hexagonal number

947 prime number, sum of seven consecutive primes (113 + 127 + 131 + 137 + 139 + 149 + 151), balanced prime, Chen prime, Eisenstein prime with no imaginary part

948 = 2² × 3 × 79, nontotient

949 = 13 × 73

950 = 2 × 5² × 19, nontotient, also one of two ISBN Group Identifiers for books published in Argentina

951 = 3 × 317, centered pentagonal number, also one of two ISBN Group Identifiers for books published in Finland

952 = 2³ × 7 × 17

952 is also 9-5-2, a card game similar to bridge.
one of two ISBN Group Identifiers for books published in Finland

953 prime number, Sophie Germain prime, Chen prime, Eisenstein prime with no imaginary part, centered heptagonal number, also ISBN Group Identifier for books published in Croatia

954 = 2 × 3² × 53, sum of ten consecutive primes (73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113), nontotient, Harshad number, also ISBN Group Identifier for books published in Bulgaria

955 = 5 × 191, also ISBN Group Identifier for books published in Sri Lanka

956 = 2² × 239, also ISBN Group Identifier for books published in Chile

957 = 3 × 11 × 29, sphenic number, also one of two ISBN Group Identifiers for books published in Taiwan and China

958 = 2 × 479, nontotient, Smith number, the ISBN Group Identifier for books published in Colombia, the millesimal fineness number for Britannia silver

959 = 7 × 137, Carol number, also ISBN Group Identifier for books published in Cuba

960 = 2⁶ × 3 × 5, sum of six consecutive primes (149 + 151 + 157 + 163 + 167 + 173), Harshad number, also ISBN Group Identifier for books published in Greece

961 = 31², sum of three consecutive primes (313 + 317 + 331), sum of five consecutive primes (181 + 191 + 193 + 197 + 199), centered octagonal number, also ISBN Group Identifier for books published in Slovenia

962 = 2 × 13 × 37, sphenic number, nontotient, also one of two ISBN Group Identifiers for books published in Hong Kong

963 = 3² × 107, sum of the first twenty-four primes, also ISBN Group Identifier for books published in Hungary

964 = 2² × 241, sum of four consecutive primes (233 + 239 + 241 + 251), nontotient, totient sum for first 56 integers, also ISBN Group Identifier for books published in Iran

965 = 5 × 193, also ISBN Group Identifier for books published in Israel

966 = 2 × 3 × 7 × 23, sum of eight consecutive primes (103 + 107 + 109 + 113 + 127 + 131 + 137 + 139), Harshad number, also one of two ISBN Group Identifiers for books published in Ukraine

967 prime number, also one of two ISBN Group Identifiers for books published in Malaysia

968 = 2³ × 11², nontotient, also one of two ISBN Group Identifiers for books published in Mexico

969 = 3 × 17 × 19, sphenic number, nonagonal number, tetrahedral number, also ISBN Group Identifier for books published in Pakistan

970 = 2 × 5 × 97, sphenic number, also one of two ISBN Group Identifiers for books published in Mexico

971 prime number, Chen prime, Eisenstein prime with no imaginary part, also ISBN Group Identifier for books published in the Philippines

972 = 2² × 3⁵, Harshad number, also one of two ISBN Group Identifiers for books published in Portugal

973 = 7 × 139, also ISBN Group Identifier for books published in Romania

974 = 2 × 487, nontotient, also ISBN Group Identifier for books published in Thailand

975 = 3 × 5² × 13, also ISBN Group Identifier for books published in Turkey

976 = 2⁴ × 61, decagonal number, also ISBN Group Identifier for books published in Antigua, Bahamas, Barbados, Belize, Cayman Islands, Dominica, Grenada, Guyana, Jamaica, Montserrat, Saint Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and the British Virgin Islands

977 prime number, sum of nine consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131), balanced prime, Chen prime, Eisenstein prime with no imaginary part, Stern prime, strictly non-palindromic number, also ISBN Group Identifier for books published in Egypt

978 = 2 × 3 × 163, sphenic number, nontotient, also ISBN Group Identifier for books published in Nigeria

979 = 11 × 89, also ISBN Group Identifier for books published in Indonesia

980 = 2² × 5 × 7², also ISBN Group Identifier for books published in Venezuela

981 = 3² × 109, also one of two ISBN Group Identifiers for books published in Singapore

982 = 2 × 491, also ISBN Group Identifier for books published in the Cook Islands, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Caledonia, Niue, Palau, Solomon Islands, Tokelau, Tonga, Tuvalu, Vanuatu, Western Samoa

983 prime number, safe prime, Chen prime, Eisenstein prime with no imaginary part, Wedderburn-Etherington number, strictly non-palindromic number, also one of two ISBN Group Identifiers for books published in Malaysia

984 = 2³ × 3 × 41, also ISBN Group Identifier for books published in Bangladesh

985 = 5 × 197, sum of three consecutive primes (317 + 331 + 337), Markov number, Pell number, Smith number, also one of two ISBN Group Identifiers for books published in Belarus

986 = 2 × 17 × 29, sphenic number, nontotient, also one of two ISBN Group Identifiers for books published in Taiwan and China

987 = 3 × 7 × 47, Fibonacci number, also one of two ISBN Group Identifiers for books published in Argentina

988 = 2² × 13 × 19, sum of four consecutive primes (239 + 241 + 251 + 257), nontotient, also one of two ISBN Group Identifiers for books published in Hong Kong

989 = 23 × 43, also one of two ISBN Group Identifiers for books published in Portugal

990 = 2 × 3² × 5 × 11, sum of six consecutive primes (151 + 157 + 163 + 167 + 173 + 179), triangular number, Harshad number

991 prime number, sum of five consecutive primes (191 + 193 + 197 + 199 + 211), sum of seven consecutive primes (127 + 131 + 137 + 139 + 149 + 151 + 157), Chen prime

992 = 2⁵ × 31, pronic number, nontotient; number of eleven-dimensional exotic spheres ^*.

993 = 3 × 331

994 = 2 × 7 × 71, sphenic number, nontotient

995 = 5 × 199

996 = 2² × 3 × 83

997 prime number, strictly non-palindromic number

998 = 2 × 499, nontotient

999 = 3³ × 37, Kaprekar number, Harshad number

In some parts of the world, such as the UK and Commonwealth countries, 999 (pronounced as 9-9-9) is the emergency telephone number; it is as of 2004 being quickly supplemented, by the international emergency number 1-1-2 and the North American 9-1-1.
999 was also the name of a significant London punk band active during the 1970s.

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