31992990 has 16 divisors (see below), whose sum is σ = 76783248. Its totient is φ = 8531456.

The previous prime is 31992971. The next prime is 31993001. The reversal of 31992990 is 9929913.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533187 + ... + 533246.

It is an arithmetic number, because the mean of its divisors is an integer number (4798953).

Almost surely, 2^31992990 is an apocalyptic number.

31992990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31992990 is an abundant number, since it is smaller than the sum of its proper divisors (44790258).

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

31992990 is a wasteful number, since it uses less digits than its factorization.

31992990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066443.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 31992990 is about 5656.2346132387. The cubic root of 31992990 is about 317.4570260311.

The spelling of 31992990 in words is "thirty-one million, nine hundred ninety-two thousand, nine hundred ninety".