31897970 has 32 divisors (see below), whose sum is σ = 63972720. Its totient is φ = 11370240.

The previous prime is 31897969. The next prime is 31897981. The reversal of 31897970 is 7979813.

It can be written as a sum of positive squares in 8 ways, for example, as 13741849 + 18156121 = 3707^2 + 4261^2 .

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, 461 + ... + 8000.

Almost surely, 2^31897970 is an apocalyptic number.

31897970 is an abundant number, since it is smaller than the sum of its proper divisors (32074750).

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

31897970 is a wasteful number, since it uses less digits than its factorization.

31897970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8510.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 31897970 is about 5647.8287863568. The cubic root of 31897970 is about 317.1424292047.

The spelling of 31897970 in words is "thirty-one million, eight hundred ninety-seven thousand, nine hundred seventy".