31386944 has 14 divisors (see below), whose sum is σ = 62283594. Its totient is φ = 15693440.

The previous prime is 31386919. The next prime is 31386959. The reversal of 31386944 is 44968313.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 473344 = 5560^2 + 688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31386898 and 31386907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245147 + ... + 245274.

Almost surely, 2^31386944 is an apocalyptic number.

It is an amenable number.

31386944 is a deficient number, since it is larger than the sum of its proper divisors (30896650).

31386944 is an equidigital number, since it uses as much as digits as its factorization.

31386944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490433 (or 490423 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 31386944 is about 5602.4051977700. The cubic root of 31386944 is about 315.4396950249.

The spelling of 31386944 in words is "thirty-one million, three hundred eighty-six thousand, nine hundred forty-four".