31979136 has 64 divisors (see below), whose sum is σ = 97087680. Its totient is φ = 9136128.

The previous prime is 31979119. The next prime is 31979161. The reversal of 31979136 is 63197913.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 31979094 and 31979103.

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, 3261 + ... + 8636.

It is an arithmetic number, because the mean of its divisors is an integer number (1516995).

Almost surely, 2^31979136 is an apocalyptic number.

It is an amenable number.

31979136 is an abundant number, since it is smaller than the sum of its proper divisors (65108544).

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

31979136 is a wasteful number, since it uses less digits than its factorization.

31979136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11921 (or 11909 counting only the distinct ones).

The product of its digits is 30618, while the sum is 39.

The square root of 31979136 is about 5655.0098143151. The cubic root of 31979136 is about 317.4111963600.

The spelling of 31979136 in words is "thirty-one million, nine hundred seventy-nine thousand, one hundred thirty-six".