399679056999 has 32 divisors (see below), whose sum is σ = 606415412160. Its totient is φ = 260070580224.

The previous prime is 399679056989. The next prime is 399679057009. The reversal of 399679056999 is 999650976993.

399679056999 is a `hidden beast` number, since 399 + 6 + 7 + 90 + 56 + 9 + 99 = 666.

It is an interprime number because it is at equal distance from previous prime (399679056989) and next prime (399679057009).

It is not a de Polignac number, because 399679056999 - 2⁸ = 399679056743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399679056989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447394 + ... + 999759.

It is an arithmetic number, because the mean of its divisors is an integer number (18950481630).

Almost surely, 2^399679056999 is an apocalyptic number.

399679056999 is a deficient number, since it is larger than the sum of its proper divisors (206736355161).

399679056999 is a wasteful number, since it uses less digits than its factorization.

399679056999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447408 (or 1447402 counting only the distinct ones).

The product of its (nonzero) digits is 2008846980, while the sum is 81.

The spelling of 399679056999 in words is "three hundred ninety-nine billion, six hundred seventy-nine million, fifty-six thousand, nine hundred ninety-nine".