399055956 has 48 divisors (see below), whose sum is σ = 1004238144. Its totient is φ = 122605056.

The previous prime is 399055931. The next prime is 399055973. The reversal of 399055956 is 659550993.

It is a junction number, because it is equal to n+sod(n) for n = 399055899 and 399055908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136300 + ... + 139196.

It is an arithmetic number, because the mean of its divisors is an integer number (20921628).

Almost surely, 2^399055956 is an apocalyptic number.

It is an amenable number.

399055956 is an abundant number, since it is smaller than the sum of its proper divisors (605182188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399055956 is a wasteful number, since it uses less digits than its factorization.

399055956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800 (or 3798 counting only the distinct ones).

The product of its (nonzero) digits is 1640250, while the sum is 51.

The square root of 399055956 is about 19976.3849582451. The cubic root of 399055956 is about 736.2261951462.

The spelling of 399055956 in words is "three hundred ninety-nine million, fifty-five thousand, nine hundred fifty-six".