390871656 has 80 divisors (see below), whose sum is σ = 1251217440. Its totient is φ = 111676320.

The previous prime is 390871631. The next prime is 390871703. The reversal of 390871656 is 656178093.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38550 + ... + 47621.

It is an arithmetic number, because the mean of its divisors is an integer number (15640218).

Almost surely, 2^390871656 is an apocalyptic number.

390871656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

390871656 is an abundant number, since it is smaller than the sum of its proper divisors (860345784).

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

390871656 is a wasteful number, since it uses less digits than its factorization.

390871656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86196 (or 86183 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 390871656 is about 19770.4743493928. The cubic root of 390871656 is about 731.1582638372.

The spelling of 390871656 in words is "three hundred ninety million, eight hundred seventy-one thousand, six hundred fifty-six".