31242188 has 12 divisors (see below), whose sum is σ = 57051120. Its totient is φ = 14941872.

The previous prime is 31242179. The next prime is 31242191. The reversal of 31242188 is 88124213.

It is a super-2 number, since 2×31242188² = 1952148622054688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31242188.

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, 169703 + ... + 169886.

It is an arithmetic number, because the mean of its divisors is an integer number (4754260).

Almost surely, 2^31242188 is an apocalyptic number.

It is an amenable number.

31242188 is a deficient number, since it is larger than the sum of its proper divisors (25808932).

31242188 is a wasteful number, since it uses less digits than its factorization.

31242188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339616 (or 339614 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 31242188 is about 5589.4711735548. The cubic root of 31242188 is about 314.9540136110.

The spelling of 31242188 in words is "thirty-one million, two hundred forty-two thousand, one hundred eighty-eight".