31399452 has 36 divisors (see below), whose sum is σ = 90710256. Its totient is φ = 8971200.

The previous prime is 31399451. The next prime is 31399469. The reversal of 31399452 is 25499313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31399451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62049 + ... + 62552.

Almost surely, 2^31399452 is an apocalyptic number.

It is an amenable number.

31399452 is an abundant number, since it is smaller than the sum of its proper divisors (59310804).

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

31399452 is a wasteful number, since it uses less digits than its factorization.

31399452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124618 (or 124613 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 31399452 is about 5603.5213928386. The cubic root of 31399452 is about 315.4815913806.

The spelling of 31399452 in words is "thirty-one million, three hundred ninety-nine thousand, four hundred fifty-two".