31997982 has 16 divisors (see below), whose sum is σ = 64253952. Its totient is φ = 10623000.

The previous prime is 31997971. The next prime is 31997989. The reversal of 31997982 is 28979913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31997989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9118 + ... + 12129.

It is an arithmetic number, because the mean of its divisors is an integer number (4015872).

Almost surely, 2^31997982 is an apocalyptic number.

31997982 is an abundant number, since it is smaller than the sum of its proper divisors (32255970).

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

31997982 is a wasteful number, since it uses less digits than its factorization.

31997982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21503.

The product of its digits is 244944, while the sum is 48.

The square root of 31997982 is about 5656.6758789947. The cubic root of 31997982 is about 317.4735365548.

The spelling of 31997982 in words is "thirty-one million, nine hundred ninety-seven thousand, nine hundred eighty-two".