400087999 has 2 divisors, whose sum is σ = 400088000. Its totient is φ = 400087998.

The previous prime is 400087969. The next prime is 400088033. The reversal of 400087999 is 999780004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400087999 - 2⁷ = 400087871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400087969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200043999 + 200044000.

It is an arithmetic number, because the mean of its divisors is an integer number (200044000).

Almost surely, 2^400087999 is an apocalyptic number.

400087999 is a deficient number, since it is larger than the sum of its proper divisors (1).

400087999 is an equidigital number, since it uses as much as digits as its factorization.

400087999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 400087999 is about 20002.1998540161. The cubic root of 400087999 is about 736.8603276142.

The spelling of 400087999 in words is "four hundred million, eighty-seven thousand, nine hundred ninety-nine".