31995986 has 16 divisors (see below), whose sum is σ = 52570080. Its totient is φ = 14484480.

The previous prime is 31995983. The next prime is 31996021. The reversal of 31995986 is 68959913.

It is a super-2 number, since 2×31995986² = 2047486240224392, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31995983) 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 in 7 ways as a sum of consecutive naturals, for example, 2825 + ... + 8483.

It is an arithmetic number, because the mean of its divisors is an integer number (3285630).

Almost surely, 2^31995986 is an apocalyptic number.

31995986 is a deficient number, since it is larger than the sum of its proper divisors (20574094).

31995986 is a wasteful number, since it uses less digits than its factorization.

31995986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929.

The product of its digits is 524880, while the sum is 50.

The square root of 31995986 is about 5656.4994475382. The cubic root of 31995986 is about 317.4669351973.

The spelling of 31995986 in words is "thirty-one million, nine hundred ninety-five thousand, nine hundred eighty-six".