31989896 has 8 divisors (see below), whose sum is σ = 59981070. Its totient is φ = 15994944.

The previous prime is 31989889. The next prime is 31989907. The reversal of 31989896 is 69898913.

It can be written as a sum of positive squares in only one way, i.e., 29052100 + 2937796 = 5390^2 + 1714^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999361 + ... + 1999376.

Almost surely, 2^31989896 is an apocalyptic number.

It is an amenable number.

31989896 is a deficient number, since it is larger than the sum of its proper divisors (27991174).

31989896 is a wasteful number, since it uses less digits than its factorization.

31989896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998743 (or 3998739 counting only the distinct ones).

The product of its digits is 839808, while the sum is 53.

The square root of 31989896 is about 5655.9611031194. The cubic root of 31989896 is about 317.4467920840.

The spelling of 31989896 in words is "thirty-one million, nine hundred eighty-nine thousand, eight hundred ninety-six".