31995972 has 120 divisors (see below), whose sum is σ = 91536984. Its totient is φ = 9704448.

The previous prime is 31995959. The next prime is 31995983. The reversal of 31995972 is 27959913.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12068676 + 19927296 = 3474^2 + 4464^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 203718 + ... + 203874.

Almost surely, 2^31995972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31995972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45768492).

31995972 is an abundant number, since it is smaller than the sum of its proper divisors (59541012).

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

31995972 is a wasteful number, since it uses less digits than its factorization.

31995972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 216 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 31995972 is about 5656.4982100236. The cubic root of 31995972 is about 317.4668888942.

The spelling of 31995972 in words is "thirty-one million, nine hundred ninety-five thousand, nine hundred seventy-two".