31188980 has 12 divisors (see below), whose sum is σ = 65496900. Its totient is φ = 12475584.

The previous prime is 31188979. The next prime is 31188991. The reversal of 31188980 is 8988113.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 8797156 = 4732^2 + 2966^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779705 + ... + 779744.

It is an arithmetic number, because the mean of its divisors is an integer number (5458075).

Almost surely, 2^31188980 is an apocalyptic number.

It is an amenable number.

31188980 is an abundant number, since it is smaller than the sum of its proper divisors (34307920).

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

31188980 is a wasteful number, since it uses less digits than its factorization.

31188980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559458 (or 1559456 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 31188980 is about 5584.7094821486. The cubic root of 31188980 is about 314.7751145358.

The spelling of 31188980 in words is "thirty-one million, one hundred eighty-eight thousand, nine hundred eighty".