31980372 has 12 divisors (see below), whose sum is σ = 74620896. Its totient is φ = 10660120.

The previous prime is 31980371. The next prime is 31980391. The reversal of 31980372 is 27308913.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31980371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332504 + ... + 1332527.

It is an arithmetic number, because the mean of its divisors is an integer number (6218408).

Almost surely, 2^31980372 is an apocalyptic number.

It is an amenable number.

31980372 is an abundant number, since it is smaller than the sum of its proper divisors (42640524).

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

31980372 is a wasteful number, since it uses less digits than its factorization.

31980372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665038 (or 2665036 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 31980372 is about 5655.1190968891. The cubic root of 31980372 is about 317.4152856427.

The spelling of 31980372 in words is "thirty-one million, nine hundred eighty thousand, three hundred seventy-two".