31980312 has 128 divisors (see below), whose sum is σ = 109401600. Its totient is φ = 8429184.

The previous prime is 31980307. The next prime is 31980323. The reversal of 31980312 is 21308913.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18843 + ... + 20469.

It is an arithmetic number, because the mean of its divisors is an integer number (854700).

Almost surely, 2^31980312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31980312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54700800).

31980312 is an abundant number, since it is smaller than the sum of its proper divisors (77421288).

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

31980312 is a wasteful number, since it uses less digits than its factorization.

31980312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662 (or 1652 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 31980312 is about 5655.1137919586. The cubic root of 31980312 is about 317.4150871363.

The spelling of 31980312 in words is "thirty-one million, nine hundred eighty thousand, three hundred twelve".