31438904 has 16 divisors (see below), whose sum is σ = 67369200. Its totient is φ = 13473792.

The previous prime is 31438889. The next prime is 31438909. The reversal of 31438904 is 40983413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31438909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280649 + ... + 280760.

It is an arithmetic number, because the mean of its divisors is an integer number (4210575).

Almost surely, 2^31438904 is an apocalyptic number.

It is an amenable number.

31438904 is an abundant number, since it is smaller than the sum of its proper divisors (35930296).

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

31438904 is a wasteful number, since it uses less digits than its factorization.

31438904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561422 (or 561418 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 31438904 is about 5607.0405741353. The cubic root of 31438904 is about 315.6136655604.

The spelling of 31438904 in words is "thirty-one million, four hundred thirty-eight thousand, nine hundred four".