31620442 has 16 divisors (see below), whose sum is σ = 57395520. Its totient is φ = 12754368.

The previous prime is 31620431. The next prime is 31620443. The reversal of 31620442 is 24402613.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31620443) 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, 66192 + ... + 66667.

It is an arithmetic number, because the mean of its divisors is an integer number (3587220).

Almost surely, 2^31620442 is an apocalyptic number.

31620442 is a deficient number, since it is larger than the sum of its proper divisors (25775078).

31620442 is a wasteful number, since it uses less digits than its factorization.

31620442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132885.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 31620442 is about 5623.2056693669. The cubic root of 31620442 is about 316.2199838197.

The spelling of 31620442 in words is "thirty-one million, six hundred twenty thousand, four hundred forty-two".