31938842 has 16 divisors (see below), whose sum is σ = 51687720. Its totient is φ = 14714112.

The previous prime is 31938827. The next prime is 31938847. The reversal of 31938842 is 24883913.

It can be written as a sum of positive squares in 4 ways, for example, as 25593481 + 6345361 = 5059^2 + 2519^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31938796 and 31938805.

It is not an unprimeable number, because it can be changed into a prime (31938847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24134 + ... + 25422.

Almost surely, 2^31938842 is an apocalyptic number.

31938842 is a deficient number, since it is larger than the sum of its proper divisors (19748878).

31938842 is a wasteful number, since it uses less digits than its factorization.

31938842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257.

The product of its digits is 41472, while the sum is 38.

The square root of 31938842 is about 5651.4460096510. The cubic root of 31938842 is about 317.2778266712.

The spelling of 31938842 in words is "thirty-one million, nine hundred thirty-eight thousand, eight hundred forty-two".