31989984 has 48 divisors (see below), whose sum is σ = 90436752. Its totient is φ = 9842688.

The previous prime is 31989983. The next prime is 31990003. The reversal of 31989984 is 48998913.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31989983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11569 + ... + 14064.

It is an arithmetic number, because the mean of its divisors is an integer number (1884099).

Almost surely, 2^31989984 is an apocalyptic number.

It is an amenable number.

31989984 is an abundant number, since it is smaller than the sum of its proper divisors (58446768).

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

31989984 is a wasteful number, since it uses less digits than its factorization.

31989984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25659 (or 25651 counting only the distinct ones).

The product of its digits is 559872, while the sum is 51.

The square root of 31989984 is about 5655.9688825169. The cubic root of 31989984 is about 317.4470831685.

The spelling of 31989984 in words is "thirty-one million, nine hundred eighty-nine thousand, nine hundred eighty-four".