31398772 has 24 divisors (see below), whose sum is σ = 58677696. Its totient is φ = 14665728.

The previous prime is 31398761. The next prime is 31398791. The reversal of 31398772 is 27789313.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 13 + ... + 7924.

It is an arithmetic number, because the mean of its divisors is an integer number (2444904).

Almost surely, 2^31398772 is an apocalyptic number.

It is an amenable number.

31398772 is a deficient number, since it is larger than the sum of its proper divisors (27278924).

31398772 is a wasteful number, since it uses less digits than its factorization.

31398772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8007 (or 8005 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 31398772 is about 5603.4607163788. The cubic root of 31398772 is about 315.4793139626.

It can be divided in two parts, 3139 and 8772, that added together give a palindrome (11911).

The spelling of 31398772 in words is "thirty-one million, three hundred ninety-eight thousand, seven hundred seventy-two".