13688539 has 2 divisors, whose sum is σ = 13688540. Its totient is φ = 13688538.

The previous prime is 13688527. The next prime is 13688561. The reversal of 13688539 is 93588631.

It is a weak prime.

It is an emirp because it is prime and its reverse (93588631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13688539 - 2⁹ = 13688027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13688495 and 13688504.

It is not a weakly prime, because it can be changed into another prime (13688599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6844269 + 6844270.

It is an arithmetic number, because the mean of its divisors is an integer number (6844270).

Almost surely, 2^13688539 is an apocalyptic number.

13688539 is a deficient number, since it is larger than the sum of its proper divisors (1).

13688539 is an equidigital number, since it uses as much as digits as its factorization.

13688539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 13688539 is about 3699.8025622998. The cubic root of 13688539 is about 239.2135076152.

The spelling of 13688539 in words is "thirteen million, six hundred eighty-eight thousand, five hundred thirty-nine".