13686831 has 6 divisors (see below), whose sum is σ = 19769880. Its totient is φ = 9124548.

The previous prime is 13686809. The next prime is 13686833. The reversal of 13686831 is 13868631.

13686831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13686831 - 2⁶ = 13686767 is a prime.

It is a super-2 number, since 2×13686831² = 374658685645122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13686833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 760371 + ... + 760388.

It is an arithmetic number, because the mean of its divisors is an integer number (3294980).

Almost surely, 2^13686831 is an apocalyptic number.

13686831 is a deficient number, since it is larger than the sum of its proper divisors (6083049).

13686831 is a wasteful number, since it uses less digits than its factorization.

13686831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520765 (or 1520762 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13686831 is about 3699.5717319711. The cubic root of 13686831 is about 239.2035578398.

The spelling of 13686831 in words is "thirteen million, six hundred eighty-six thousand, eight hundred thirty-one".