31212980 has 24 divisors (see below), whose sum is σ = 66340512. Its totient is φ = 12334112.

The previous prime is 31212899. The next prime is 31213009. The reversal of 31212980 is 8921213.

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, 7742 + ... + 11061.

It is an arithmetic number, because the mean of its divisors is an integer number (2764188).

Almost surely, 2^31212980 is an apocalyptic number.

It is an amenable number.

31212980 is an abundant number, since it is smaller than the sum of its proper divisors (35127532).

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

31212980 is a wasteful number, since it uses less digits than its factorization.

31212980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18895 (or 18893 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31212980 is about 5586.8577930712. The cubic root of 31212980 is about 314.8558339204.

The spelling of 31212980 in words is "thirty-one million, two hundred twelve thousand, nine hundred eighty".