391616904 has 128 divisors (see below), whose sum is σ = 1193472000. Its totient is φ = 104592384.

The previous prime is 391616903. The next prime is 391616909. The reversal of 391616904 is 409616193.

It is not an unprimeable number, because it can be changed into a prime (391616903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251392 + ... + 252944.

It is an arithmetic number, because the mean of its divisors is an integer number (9324000).

Almost surely, 2^391616904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391616904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596736000).

391616904 is an abundant number, since it is smaller than the sum of its proper divisors (801855096).

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

391616904 is a wasteful number, since it uses less digits than its factorization.

391616904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 391616904 is about 19789.3128733668. The cubic root of 391616904 is about 731.6226518171.

The spelling of 391616904 in words is "three hundred ninety-one million, six hundred sixteen thousand, nine hundred four".