390257856 has 42 divisors (see below), whose sum is σ = 1118605332. Its totient is φ = 130085760.

The previous prime is 390257761. The next prime is 390257863. The reversal of 390257856 is 658752093.

It is a happy number.

390257856 is a `hidden beast` number, since 390 + 257 + 8 + 5 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 338190 + ... + 339341.

Almost surely, 2^390257856 is an apocalyptic number.

390257856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

390257856 is an abundant number, since it is smaller than the sum of its proper divisors (728347476).

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

390257856 is a wasteful number, since it uses less digits than its factorization.

390257856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677549 (or 677536 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 390257856 is about 19754.9451024294. The cubic root of 390257856 is about 730.7753418431.

The spelling of 390257856 in words is "three hundred ninety million, two hundred fifty-seven thousand, eight hundred fifty-six".