31885972 has 6 divisors (see below), whose sum is σ = 55800458. Its totient is φ = 15942984.

The previous prime is 31885967. The next prime is 31885991. The reversal of 31885972 is 27958813.

It can be written as a sum of positive squares in only one way, i.e., 30074256 + 1811716 = 5484^2 + 1346^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985743 + ... + 3985750.

Almost surely, 2^31885972 is an apocalyptic number.

It is an amenable number.

31885972 is a deficient number, since it is larger than the sum of its proper divisors (23914486).

31885972 is a wasteful number, since it uses less digits than its factorization.

31885972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7971497 (or 7971495 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 31885972 is about 5646.7665083657. The cubic root of 31885972 is about 317.1026612399.

The spelling of 31885972 in words is "thirty-one million, eight hundred eighty-five thousand, nine hundred seventy-two".