31229972 has 12 divisors (see below), whose sum is σ = 55052340. Its totient is φ = 15500736.

The previous prime is 31229959. The next prime is 31229981. The reversal of 31229972 is 27992213.

It can be written as a sum of positive squares in 2 ways, for example, as 23367556 + 7862416 = 4834^2 + 2804^2 .

It is a super-2 number, since 2×31229972² = 1950622302241568, which contains 22 as substring.

It is a congruent number.

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, 27947 + ... + 29042.

It is an arithmetic number, because the mean of its divisors is an integer number (4587695).

Almost surely, 2^31229972 is an apocalyptic number.

It is an amenable number.

31229972 is a deficient number, since it is larger than the sum of its proper divisors (23822368).

31229972 is a wasteful number, since it uses less digits than its factorization.

31229972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57130 (or 57128 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 31229972 is about 5588.3782978607. The cubic root of 31229972 is about 314.9129582299.

The spelling of 31229972 in words is "thirty-one million, two hundred twenty-nine thousand, nine hundred seventy-two".