31971408 has 40 divisors (see below), whose sum is σ = 94392768. Its totient is φ = 9134592.

The previous prime is 31971391. The next prime is 31971409. The reversal of 31971408 is 80417913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31971409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47241 + ... + 47912.

Almost surely, 2^31971408 is an apocalyptic number.

It is an amenable number.

31971408 is an abundant number, since it is smaller than the sum of its proper divisors (62421360).

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

31971408 is a wasteful number, since it uses less digits than its factorization.

31971408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95171 (or 95165 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 31971408 is about 5654.3264850909. The cubic root of 31971408 is about 317.3856260283.

The spelling of 31971408 in words is "thirty-one million, nine hundred seventy-one thousand, four hundred eight".