31393956 has 48 divisors (see below), whose sum is σ = 81785088. Its totient is φ = 9290400.

The previous prime is 31393937. The next prime is 31393981. The reversal of 31393956 is 65939313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2911 + ... + 8441.

It is an arithmetic number, because the mean of its divisors is an integer number (1703856).

Almost surely, 2^31393956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31393956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40892544).

31393956 is an abundant number, since it is smaller than the sum of its proper divisors (50391132).

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

31393956 is a wasteful number, since it uses less digits than its factorization.

31393956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592 (or 5590 counting only the distinct ones).

The product of its digits is 65610, while the sum is 39.

The square root of 31393956 is about 5603.0309654686. The cubic root of 31393956 is about 315.4631835434.

The spelling of 31393956 in words is "thirty-one million, three hundred ninety-three thousand, nine hundred fifty-six".