Four thousand (4000) is the natural number following 3999 and preceding 4001. It is a decagonal number.

Selected numbers in the range 4001-4999

• 4005 - triangular number
• 4007 - safe prime
• 4010 - magic constant of n×n magic square and n-Queens Problem for n = 20.
• 4013 - balanced prime
• 4019 - Sophie Germain prime
• 4028 - sum of the first 45 primes
• 4030 - 3rd weird number
• 4031 - sum of the cubes of the first six primes
• 4033 - 6th super-Poulet number
• 4060 - tetrahedral number
• 4073 - Sophie Germain prime
• 4079 - safe prime
• 4095 - triangular number
• 4096 - 12th power of two, 16th cube, 64^2, smallest number with exactly 13 divisors
• 4104 = 2^3 + 16^3 = 9^3 + 15^3
• 4127 - safe prime
• 4139 - safe prime
• 4140 - Bell number
• 4166 - centered heptagonal number
• 4181 - Fibonacci number, Markov number
• 4186 - triangular number
• 4199 - highly cototient number
• 4200 - nonagonal number, pentagonal pyramidal number
• 4210 - 11th semi-meandric number
• 4211 - Sophie Germain prime
• 4219 - cuban prime of the form x = y + 1
• 4223 - Kynea number
• 4225 = 65^2, centered octagonal number
• 4227 - sum of the first 46 primes
• 4240 - Leyland number
• 4257 - decagonal number
• 4259 - safe prime
• 4271 - Sophie Germain prime
• 4278 - triangular number
• 4283 - safe prime
• 4289 - highly cototient number
• 4324 - 23rd square pyramidal number
• 4349 - Sophie Germain prime
• 4356 - sum of the cubes of the first eleven integers, 66^2
• 4369 - 7th super-Poulet number
• 4371 - triangular number
• 4373 - Sophie Germain prime
• 4391 - Sophie Germain prime
• 4397 - Year of Comet Hale-Bopp's return, a prime number
• 4400 - the number of missing persons in the sci-fi show The 4400
• 4409 - Sophie Germain prime, highly cototient number, balanced prime
• 4411 - centered heptagonal number
• 4421 - alternating factorial
• 4438 - sum of the first 47 primes
• 4446 - nonagonal number
• 4447 - cuban prime of the form x = y + 1
• 4457 - balanced prime
• 4465 - triangular number
• 4481 - Sophie Germain prime
• 4489 = 67^2, centered octagonal number
• 4495 - tetrahedral number
• 4503 - largest number not the sum of four or fewer squares of composites
• 4505 - 5th Zeisel number
• 4522 - decagonal number
• 4547 - safe prime
• 4560 - triangular number
• 4579 - octahedral number
• 4597 - balanced prime
• 4607 - Woodall number
• 4619 - highly cototient number
• 4620 - the number appearing on all cheques in the Check Game (aka Blank Check) on the US TV game show The Price Is Right
• 4624 = 68^2
• 4641 - magic constant of n×n magic square and n-Queens Problem for n = 21.
• 4656 - triangular number
• 4657 - balanced prime
• 4661 - sum of the first 48 primes
• 4663 - centered heptagonal number
• 4679 - safe prime
• 4681 - 8th super-Poulet number
• 4691 - balanced prime
• 4699 - nonagonal number
• 4703 - safe prime
• 4705 = 48² + 49² = 17² + 18² + ... 26²
• 4727 - sum of the squares of the first twelve primes
• 4733 - Sophie Germain prime
• 4753 - triangular number
• 4761 = 69^2, centered octagonal number
• 4787 - safe prime
• 4788 - 14th Keith number
• 4793 - Sophie Germain prime
• 4795 - decagonal number
• 4799 - safe prime
• 4801 - cuban prime of the form x = y + 2, smallest prime with a composite sum of digits in base 7
• 4847 - smallest remaining candidate for the Seventeen or Bust project to solve the Sierpinski problem; it is unknown whether 4847×2ⁿ+1 is prime for any n
• 4851 - triangular number, pentagonal pyramidal number
• 4862 - Catalan number
• 4871 - Sophie Germain prime
• 4879 - 11th Kaprekar number
• 4888 - sum of the first 49 primes
• 4900 - the only square-pyramidal square other than 1^*, 70^2
• 4913 - 17th cube
• 4919 - Sophie Germain prime, safe prime
• 4922 - centered heptagonal number
• 4941 - centered cube number
• 4943 - Sophie Germain prime
• 4950 - triangular number, 12th Kaprekar number
• 4959 - nonagonal number
• 4960 - tetrahedral number; greater of 4th pair of Smith brothers
• 4993 - balanced prime

Integers

Nombres 4000 à 4999 | 4000 | 4000 (število) | 4000 | 4000 (số)