31382172 has 18 divisors (see below), whose sum is σ = 79327248. Its totient is φ = 10460712.

The previous prime is 31382171. The next prime is 31382173. The reversal of 31382172 is 27128313.

It is an interprime number because it is at equal distance from previous prime (31382171) and next prime (31382173).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31382171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 435828 + ... + 435899.

Almost surely, 2^31382172 is an apocalyptic number.

It is an amenable number.

31382172 is an abundant number, since it is smaller than the sum of its proper divisors (47945076).

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

31382172 is a wasteful number, since it uses less digits than its factorization.

31382172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871737 (or 871732 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 31382172 is about 5601.9792930713. The cubic root of 31382172 is about 315.4237079686.

The spelling of 31382172 in words is "thirty-one million, three hundred eighty-two thousand, one hundred seventy-two".