31429686 has 16 divisors (see below), whose sum is σ = 66168000. Its totient is φ = 9925128.

The previous prime is 31429681. The next prime is 31429703. The reversal of 31429686 is 68692413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31429681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137736 + ... + 137963.

It is an arithmetic number, because the mean of its divisors is an integer number (4135500).

Almost surely, 2^31429686 is an apocalyptic number.

31429686 is an abundant number, since it is smaller than the sum of its proper divisors (34738314).

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

31429686 is a wasteful number, since it uses less digits than its factorization.

31429686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275723.

The product of its digits is 62208, while the sum is 39.

The square root of 31429686 is about 5606.2185116173. The cubic root of 31429686 is about 315.5828161902.

The spelling of 31429686 in words is "thirty-one million, four hundred twenty-nine thousand, six hundred eighty-six".