13931686 has 8 divisors (see below), whose sum is σ = 21291984. Its totient is φ = 6834360.

The previous prime is 13931683. The next prime is 13931707. The reversal of 13931686 is 68613931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13931681) 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 3 ways as a sum of consecutive naturals, for example, 65610 + ... + 65821.

It is an arithmetic number, because the mean of its divisors is an integer number (2661498).

Almost surely, 2^13931686 is an apocalyptic number.

13931686 is a deficient number, since it is larger than the sum of its proper divisors (7360298).

13931686 is a wasteful number, since it uses less digits than its factorization.

13931686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131486.

The product of its digits is 23328, while the sum is 37.

The square root of 13931686 is about 3732.5173810714. The cubic root of 13931686 is about 240.6215716833.

The spelling of 13931686 in words is "thirteen million, nine hundred thirty-one thousand, six hundred eighty-six".