31303972 has 24 divisors (see below), whose sum is σ = 62881280. Its totient is φ = 13357440.

The previous prime is 31303969. The next prime is 31304003. The reversal of 31303972 is 27930313.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 31303972.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4429 + ... + 9067.

Almost surely, 2^31303972 is an apocalyptic number.

It is an amenable number.

31303972 is an abundant number, since it is smaller than the sum of its proper divisors (31577308).

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

31303972 is a wasteful number, since it uses less digits than its factorization.

31303972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891 (or 4889 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 31303972 is about 5594.9952636262. The cubic root of 31303972 is about 315.1614927363.

The spelling of 31303972 in words is "thirty-one million, three hundred three thousand, nine hundred seventy-two".