31389716 has 12 divisors (see below), whose sum is σ = 56826420. Its totient is φ = 15153600.

The previous prime is 31389707. The next prime is 31389751. The reversal of 31389716 is 61798313.

It can be written as a sum of positive squares in 2 ways, for example, as 19802500 + 11587216 = 4450^2 + 3404^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31389716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135185 + ... + 135416.

It is an arithmetic number, because the mean of its divisors is an integer number (4735535).

Almost surely, 2^31389716 is an apocalyptic number.

It is an amenable number.

31389716 is a deficient number, since it is larger than the sum of its proper divisors (25436704).

31389716 is a wasteful number, since it uses less digits than its factorization.

31389716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270634 (or 270632 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 31389716 is about 5602.6525860524. The cubic root of 31389716 is about 315.4489809782.

The spelling of 31389716 in words is "thirty-one million, three hundred eighty-nine thousand, seven hundred sixteen".