13685913 has 12 divisors (see below), whose sum is σ = 19845540. Its totient is φ = 9088416.

The previous prime is 13685887. The next prime is 13685927. The reversal of 13685913 is 31958631.

It is a happy number.

13685913 is a `hidden beast` number, since 1 + 3 + 68 + 591 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5322249 + 8363664 = 2307^2 + 2892^2 .

It is not a de Polignac number, because 13685913 - 2⁸ = 13685657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13685933) 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 11 ways as a sum of consecutive naturals, for example, 406 + ... + 5247.

It is an arithmetic number, because the mean of its divisors is an integer number (1653795).

Almost surely, 2^13685913 is an apocalyptic number.

It is an amenable number.

13685913 is a deficient number, since it is larger than the sum of its proper divisors (6159627).

13685913 is a wasteful number, since it uses less digits than its factorization.

13685913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5928 (or 5925 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 13685913 is about 3699.4476614760. The cubic root of 13685913 is about 239.1982097848.

The spelling of 13685913 in words is "thirteen million, six hundred eighty-five thousand, nine hundred thirteen".