31620939 has 16 divisors (see below), whose sum is σ = 48265728. Its totient is φ = 18038592.

The previous prime is 31620937. The next prime is 31620943. The reversal of 31620939 is 93902613.

It is not a de Polignac number, because 31620939 - 2¹ = 31620937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31620931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18874 + ... + 20480.

It is an arithmetic number, because the mean of its divisors is an integer number (3016608).

Almost surely, 2^31620939 is an apocalyptic number.

31620939 is a deficient number, since it is larger than the sum of its proper divisors (16644789).

31620939 is a wasteful number, since it uses less digits than its factorization.

31620939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 31620939 is about 5623.2498610679. The cubic root of 31620939 is about 316.2216405592.

The spelling of 31620939 in words is "thirty-one million, six hundred twenty thousand, nine hundred thirty-nine".