31989884 has 6 divisors (see below), whose sum is σ = 55982304. Its totient is φ = 15994940.

The previous prime is 31989857. The next prime is 31989889. The reversal of 31989884 is 48898913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31989889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3998732 + ... + 3998739.

It is an arithmetic number, because the mean of its divisors is an integer number (9330384).

Almost surely, 2^31989884 is an apocalyptic number.

It is an amenable number.

31989884 is a deficient number, since it is larger than the sum of its proper divisors (23992420).

31989884 is a wasteful number, since it uses less digits than its factorization.

31989884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7997475 (or 7997473 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 31989884 is about 5655.9600422917. The cubic root of 31989884 is about 317.4467523906.

The spelling of 31989884 in words is "thirty-one million, nine hundred eighty-nine thousand, eight hundred eighty-four".