31973868 has 18 divisors (see below), whose sum is σ = 80822924. Its totient is φ = 10657944.

The previous prime is 31973861. The next prime is 31973869. The reversal of 31973868 is 86837913.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (31973861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 444046 + ... + 444117.

Almost surely, 2^31973868 is an apocalyptic number.

It is an amenable number.

31973868 is an abundant number, since it is smaller than the sum of its proper divisors (48849056).

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

31973868 is a wasteful number, since it uses less digits than its factorization.

31973868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888173 (or 888168 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31973868 is about 5654.5440134462. The cubic root of 31973868 is about 317.3937660996.

The spelling of 31973868 in words is "thirty-one million, nine hundred seventy-three thousand, eight hundred sixty-eight".