391223056 has 40 divisors (see below), whose sum is σ = 883971200. Its totient is φ = 167664672.

The previous prime is 391223047. The next prime is 391223087. The reversal of 391223056 is 650322193.

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 7 ways as a sum of consecutive naturals, for example, 30156 + ... + 41131.

It is an arithmetic number, because the mean of its divisors is an integer number (22099280).

Almost surely, 2^391223056 is an apocalyptic number.

It is an amenable number.

391223056 is an abundant number, since it is smaller than the sum of its proper divisors (492748144).

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

391223056 is an equidigital number, since it uses as much as digits as its factorization.

391223056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71316 (or 71296 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 391223056 is about 19779.3593425065. The cubic root of 391223056 is about 731.3773059482.

The spelling of 391223056 in words is "three hundred ninety-one million, two hundred twenty-three thousand, fifty-six".