390391656 has 32 divisors (see below), whose sum is σ = 978812640. Its totient is φ = 129752768.

The previous prime is 390391619. The next prime is 390391667. The reversal of 390391656 is 656193093.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15111 + ... + 31766.

It is an arithmetic number, because the mean of its divisors is an integer number (30587895).

Almost surely, 2^390391656 is an apocalyptic number.

It is an amenable number.

390391656 is an abundant number, since it is smaller than the sum of its proper divisors (588420984).

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

390391656 is a wasteful number, since it uses less digits than its factorization.

390391656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47233 (or 47229 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 390391656 is about 19758.3313060592. The cubic root of 390391656 is about 730.8588478011.

It can be divided in two parts, 3903 and 91656, that added together give a palindrome (95559).

The spelling of 390391656 in words is "three hundred ninety million, three hundred ninety-one thousand, six hundred fifty-six".