31897372 has 24 divisors (see below), whose sum is σ = 63652176. Its totient is φ = 13855488.

The previous prime is 31897363. The next prime is 31897373. The reversal of 31897372 is 27379813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897373) 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, 17158 + ... + 18925.

It is an arithmetic number, because the mean of its divisors is an integer number (2652174).

Almost surely, 2^31897372 is an apocalyptic number.

It is an amenable number.

31897372 is a deficient number, since it is larger than the sum of its proper divisors (31754804).

31897372 is a wasteful number, since it uses less digits than its factorization.

31897372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36117 (or 36115 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 31897372 is about 5647.7758454103. The cubic root of 31897372 is about 317.1404473402.

The spelling of 31897372 in words is "thirty-one million, eight hundred ninety-seven thousand, three hundred seventy-two".