31979938 has 8 divisors (see below), whose sum is σ = 48091932. Its totient is φ = 15949296.

The previous prime is 31979929. The next prime is 31979963. The reversal of 31979938 is 83997913.

It can be written as a sum of positive squares in 2 ways, for example, as 28227969 + 3751969 = 5313^2 + 1937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31979891 and 31979900.

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, 19345 + ... + 20932.

Almost surely, 2^31979938 is an apocalyptic number.

31979938 is a deficient number, since it is larger than the sum of its proper divisors (16111994).

31979938 is a wasteful number, since it uses less digits than its factorization.

31979938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40676.

The product of its digits is 367416, while the sum is 49.

The square root of 31979938 is about 5655.0807244459. The cubic root of 31979938 is about 317.4138497739.

The spelling of 31979938 in words is "thirty-one million, nine hundred seventy-nine thousand, nine hundred thirty-eight".