31957980 has 24 divisors (see below), whose sum is σ = 89482512. Its totient is φ = 8522112.

The previous prime is 31957963. The next prime is 31957997. The reversal of 31957980 is 8975913.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31957963) and next prime (31957997).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266257 + ... + 266376.

It is an arithmetic number, because the mean of its divisors is an integer number (3728438).

Almost surely, 2^31957980 is an apocalyptic number.

31957980 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31957980 is an abundant number, since it is smaller than the sum of its proper divisors (57524532).

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

31957980 is a wasteful number, since it uses less digits than its factorization.

31957980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532645 (or 532643 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 31957980 is about 5653.1389510607. The cubic root of 31957980 is about 317.3411857899.

It can be divided in two parts, 3195 and 7980, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 31957980 in words is "thirty-one million, nine hundred fifty-seven thousand, nine hundred eighty".