31497984 has 270 divisors, whose sum is σ = 112779744. Its totient is φ = 8709120.

The previous prime is 31497979. The next prime is 31497997. The reversal of 31497984 is 48979413.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1016049 + ... + 1016079.

Almost surely, 2^31497984 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 31497984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56389872).

31497984 is an abundant number, since it is smaller than the sum of its proper divisors (81281760).

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

31497984 is an equidigital number, since it uses as much as digits as its factorization.

31497984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 43 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31497984 is about 5612.3064777327. The cubic root of 31497984 is about 315.8112422888.

The spelling of 31497984 in words is "thirty-one million, four hundred ninety-seven thousand, nine hundred eighty-four".