31990984 has 16 divisors (see below), whose sum is σ = 63140400. Its totient is φ = 15153552.

The previous prime is 31990979. The next prime is 31990997. The reversal of 31990984 is 48909913.

It is a self number, because there is not a number n which added to its sum of digits gives 31990984.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105082 + ... + 105385.

It is an arithmetic number, because the mean of its divisors is an integer number (3946275).

Almost surely, 2^31990984 is an apocalyptic number.

It is an amenable number.

31990984 is a deficient number, since it is larger than the sum of its proper divisors (31149416).

31990984 is a wasteful number, since it uses less digits than its factorization.

31990984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210492 (or 210488 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 31990984 is about 5656.0572840098. The cubic root of 31990984 is about 317.4503909098.

The spelling of 31990984 in words is "thirty-one million, nine hundred ninety thousand, nine hundred eighty-four".