391328904 has 16 divisors (see below), whose sum is σ = 978322320. Its totient is φ = 130442960.

The previous prime is 391328893. The next prime is 391328911. The reversal of 391328904 is 409823193.

It is a super-2 number, since 2×391328904² = 306276622211682432, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 8152662 + ... + 8152709.

It is an arithmetic number, because the mean of its divisors is an integer number (61145145).

Almost surely, 2^391328904 is an apocalyptic number.

It is an amenable number.

391328904 is an abundant number, since it is smaller than the sum of its proper divisors (586993416).

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

391328904 is a wasteful number, since it uses less digits than its factorization.

391328904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16305380 (or 16305376 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 391328904 is about 19782.0348801634. The cubic root of 391328904 is about 731.4432596654.

The spelling of 391328904 in words is "three hundred ninety-one million, three hundred twenty-eight thousand, nine hundred four".