31973972 has 6 divisors (see below), whose sum is σ = 55954458. Its totient is φ = 15986984.

The previous prime is 31973971. The next prime is 31973993. The reversal of 31973972 is 27937913.

It can be written as a sum of positive squares in only one way, i.e., 31516996 + 456976 = 5614^2 + 676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31973971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3996743 + ... + 3996750.

It is an arithmetic number, because the mean of its divisors is an integer number (9325743).

Almost surely, 2^31973972 is an apocalyptic number.

It is an amenable number.

31973972 is a deficient number, since it is larger than the sum of its proper divisors (23980486).

31973972 is a wasteful number, since it uses less digits than its factorization.

31973972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993497 (or 7993495 counting only the distinct ones).

The product of its digits is 71442, while the sum is 41.

The square root of 31973972 is about 5654.5532095825. The cubic root of 31973972 is about 317.3941102235.

The spelling of 31973972 in words is "thirty-one million, nine hundred seventy-three thousand, nine hundred seventy-two".