31986685 has 12 divisors (see below), whose sum is σ = 39457908. Its totient is φ = 24892416.

The previous prime is 31986677. The next prime is 31986697. The reversal of 31986685 is 58668913.

It can be written as a sum of positive squares in 6 ways, for example, as 12467961 + 19518724 = 3531^2 + 4418^2 .

It is not a de Polignac number, because 31986685 - 2³ = 31986677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4509 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (3288159).

Almost surely, 2^31986685 is an apocalyptic number.

It is an amenable number.

31986685 is a deficient number, since it is larger than the sum of its proper divisors (7471223).

31986685 is an equidigital number, since it uses as much as digits as its factorization.

31986685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4752 (or 4715 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 31986685 is about 5655.6772361937. The cubic root of 31986685 is about 317.4361704411.

The spelling of 31986685 in words is "thirty-one million, nine hundred eighty-six thousand, six hundred eighty-five".