390808656 has 60 divisors (see below), whose sum is σ = 1249970592. Its totient is φ = 111659328.

The previous prime is 390808651. The next prime is 390808657. The reversal of 390808656 is 656808093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390808651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192846 + ... + 194861.

Almost surely, 2^390808656 is an apocalyptic number.

390808656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

390808656 is an abundant number, since it is smaller than the sum of its proper divisors (859161936).

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

390808656 is a wasteful number, since it uses less digits than its factorization.

390808656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387728 (or 387719 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 390808656 is about 19768.8810001983. The cubic root of 390808656 is about 731.1189794627.

The spelling of 390808656 in words is "three hundred ninety million, eight hundred eight thousand, six hundred fifty-six".