31438992 has 40 divisors (see below), whose sum is σ = 87466624. Its totient is φ = 9673344.

The previous prime is 31438963. The next prime is 31438993. The reversal of 31438992 is 29983413.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 31438992.

It is not an unprimeable number, because it can be changed into a prime (31438993) 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, 24568 + ... + 25815.

Almost surely, 2^31438992 is an apocalyptic number.

It is an amenable number.

31438992 is an abundant number, since it is smaller than the sum of its proper divisors (56027632).

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

31438992 is a wasteful number, since it uses less digits than its factorization.

31438992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50407 (or 50401 counting only the distinct ones).

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

The square root of 31438992 is about 5607.0484214068. The cubic root of 31438992 is about 315.6139600360.

The spelling of 31438992 in words is "thirty-one million, four hundred thirty-eight thousand, nine hundred ninety-two".