31939488 has 96 divisors (see below), whose sum is σ = 106485120. Its totient is φ = 9123840.

The previous prime is 31939483. The next prime is 31939511. The reversal of 31939488 is 88493913.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is not an unprimeable number, because it can be changed into a prime (31939483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3408 + ... + 8688.

It is an arithmetic number, because the mean of its divisors is an integer number (1109220).

Almost surely, 2^31939488 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 31939488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53242560).

31939488 is an abundant number, since it is smaller than the sum of its proper divisors (74545632).

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

31939488 is a wasteful number, since it uses less digits than its factorization.

31939488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5307 (or 5293 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 31939488 is about 5651.5031628762. The cubic root of 31939488 is about 317.2799657604.

The spelling of 31939488 in words is "thirty-one million, nine hundred thirty-nine thousand, four hundred eighty-eight".