521326904 has 32 divisors (see below), whose sum is σ = 1119160800. Its totient is φ = 223019520.

The previous prime is 521326903. The next prime is 521326919. The reversal of 521326904 is 409623125.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521326903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23684 + ... + 40044.

It is an arithmetic number, because the mean of its divisors is an integer number (34973775).

Almost surely, 2^521326904 is an apocalyptic number.

It is an amenable number.

521326904 is an abundant number, since it is smaller than the sum of its proper divisors (597833896).

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

521326904 is a wasteful number, since it uses less digits than its factorization.

521326904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16943 (or 16939 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 521326904 is about 22832.5842602190. The cubic root of 521326904 is about 804.8285601246.

The spelling of 521326904 in words is "five hundred twenty-one million, three hundred twenty-six thousand, nine hundred four".