13686689 has 2 divisors, whose sum is σ = 13686690. Its totient is φ = 13686688.

The previous prime is 13686641. The next prime is 13686713. The reversal of 13686689 is 98668631.

13686689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 1380625 = 3508^2 + 1175^2 .

It is an emirp because it is prime and its reverse (98668631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13686689 - 2⁸ = 13686433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13686619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6843344 + 6843345.

It is an arithmetic number, because the mean of its divisors is an integer number (6843345).

Almost surely, 2^13686689 is an apocalyptic number.

It is an amenable number.

13686689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13686689 is an equidigital number, since it uses as much as digits as its factorization.

13686689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 13686689 is about 3699.5525405108. The cubic root of 13686689 is about 239.2027305964.

The spelling of 13686689 in words is "thirteen million, six hundred eighty-six thousand, six hundred eighty-nine".