31689794 has 16 divisors (see below), whose sum is σ = 48558528. Its totient is φ = 15506832.

The previous prime is 31689787. The next prime is 31689799. The reversal of 31689794 is 49798613.

It is not an unprimeable number, because it can be changed into a prime (31689799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22499 + ... + 23865.

It is an arithmetic number, because the mean of its divisors is an integer number (3034908).

Almost surely, 2^31689794 is an apocalyptic number.

31689794 is a deficient number, since it is larger than the sum of its proper divisors (16868734).

31689794 is a wasteful number, since it uses less digits than its factorization.

31689794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its digits is 326592, while the sum is 47.

The square root of 31689794 is about 5629.3688811447. The cubic root of 31689794 is about 316.4509997208.

The spelling of 31689794 in words is "thirty-one million, six hundred eighty-nine thousand, seven hundred ninety-four".