31995992 has 32 divisors (see below), whose sum is σ = 69253920. Its totient is φ = 13574400.

The previous prime is 31995983. The next prime is 31996021. The reversal of 31995992 is 29959913.

It is a congruent number.

It is an unprimeable number.

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, 2828 + ... + 8484.

It is an arithmetic number, because the mean of its divisors is an integer number (2164185).

Almost surely, 2^31995992 is an apocalyptic number.

It is a pronic number, being equal to 5656×5657.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31995992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34626960).

31995992 is an abundant number, since it is smaller than the sum of its proper divisors (37257928).

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

31995992 is a wasteful number, since it uses less digits than its factorization.

31995992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771 (or 5767 counting only the distinct ones).

The product of its digits is 196830, while the sum is 47.

The square root of 31995992 is about 5656.4999779015. The cubic root of 31995992 is about 317.4669550414.

The spelling of 31995992 in words is "thirty-one million, nine hundred ninety-five thousand, nine hundred ninety-two".