31257372 has 24 divisors (see below), whose sum is σ = 73470096. Its totient is φ = 10342528.

The previous prime is 31257353. The next prime is 31257419. The reversal of 31257372 is 27375213.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7863 + ... + 11150.

It is an arithmetic number, because the mean of its divisors is an integer number (3061254).

Almost surely, 2^31257372 is an apocalyptic number.

It is an amenable number.

31257372 is an abundant number, since it is smaller than the sum of its proper divisors (42212724).

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

31257372 is a wasteful number, since it uses less digits than its factorization.

31257372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19157 (or 19155 counting only the distinct ones).

The product of its digits is 8820, while the sum is 30.

The square root of 31257372 is about 5590.8292765922. The cubic root of 31257372 is about 315.0050288943.

It can be divided in two parts, 31 and 257372, that added together give a triangular number (257403 = T₇₁₇).

The spelling of 31257372 in words is "thirty-one million, two hundred fifty-seven thousand, three hundred seventy-two".