31897974 has 16 divisors (see below), whose sum is σ = 63889920. Its totient is φ = 10617000.

The previous prime is 31897969. The next prime is 31897981. The reversal of 31897974 is 47979813.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 967 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (3993120).

Almost surely, 2^31897974 is an apocalyptic number.

31897974 is an abundant number, since it is smaller than the sum of its proper divisors (31991946).

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

31897974 is a wasteful number, since it uses less digits than its factorization.

31897974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7835.

The product of its digits is 381024, while the sum is 48.

The square root of 31897974 is about 5647.8291404751. The cubic root of 31897974 is about 317.1424424612.

The spelling of 31897974 in words is "thirty-one million, eight hundred ninety-seven thousand, nine hundred seventy-four".