13686813 has 40 divisors (see below), whose sum is σ = 23696640. Its totient is φ = 7711200.

The previous prime is 13686809. The next prime is 13686833. The reversal of 13686813 is 31868631.

It is not a de Polignac number, because 13686813 - 2² = 13686809 is a prime.

It is a Curzon number.

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

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 57148 + ... + 57386.

It is an arithmetic number, because the mean of its divisors is an integer number (592416).

Almost surely, 2^13686813 is an apocalyptic number.

It is an amenable number.

13686813 is a deficient number, since it is larger than the sum of its proper divisors (10009827).

13686813 is a wasteful number, since it uses less digits than its factorization.

13686813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 350 counting only the distinct ones).

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

The square root of 13686813 is about 3699.5692992563. The cubic root of 13686813 is about 239.2034529783.

The spelling of 13686813 in words is "thirteen million, six hundred eighty-six thousand, eight hundred thirteen".