31489904 has 20 divisors (see below), whose sum is σ = 61496064. Its totient is φ = 15619968.

The previous prime is 31489901. The next prime is 31489919. The reversal of 31489904 is 40998413.

It is a super-2 number, since 2×31489904² = 1983228107858432, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31489901) 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, 5717 + ... + 9780.

Almost surely, 2^31489904 is an apocalyptic number.

It is an amenable number.

31489904 is a deficient number, since it is larger than the sum of its proper divisors (30006160).

31489904 is a wasteful number, since it uses less digits than its factorization.

31489904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15632 (or 15626 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 31489904 is about 5611.5865849152. The cubic root of 31489904 is about 315.7842355544.

The spelling of 31489904 in words is "thirty-one million, four hundred eighty-nine thousand, nine hundred four".