13686889 has 2 divisors, whose sum is σ = 13686890. Its totient is φ = 13686888.

The previous prime is 13686851. The next prime is 13686901. The reversal of 13686889 is 98868631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 870489 = 3580^2 + 933^2 .

It is a cyclic number.

It is not a de Polignac number, because 13686889 - 2²³ = 5298281 is a prime.

It is not a weakly prime, because it can be changed into another prime (13686809) 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 as a sum of consecutive naturals, namely, 6843444 + 6843445.

It is an arithmetic number, because the mean of its divisors is an integer number (6843445).

Almost surely, 2^13686889 is an apocalyptic number.

It is an amenable number.

13686889 is a deficient number, since it is larger than the sum of its proper divisors (1).

13686889 is an equidigital number, since it uses as much as digits as its factorization.

13686889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 13686889 is about 3699.5795707080. The cubic root of 13686889 is about 239.2038957263.

It can be divided in two parts, 136 and 86889, that added together give a square (87025 = 295²).

The spelling of 13686889 in words is "thirteen million, six hundred eighty-six thousand, eight hundred eighty-nine".