13688999 has 4 divisors (see below), whose sum is σ = 13947336. Its totient is φ = 13430664.

The previous prime is 13688989. The next prime is 13689017. The reversal of 13688999 is 99988631.

13688999 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99988631 = 43 ⋅2325317.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13688999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 258283 = 13688999 / (1 + 3 + 6 + 8 + 8 + 9 + 9 + 9).

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 13688999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13688929) 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 3 ways as a sum of consecutive naturals, for example, 129089 + ... + 129194.

It is an arithmetic number, because the mean of its divisors is an integer number (3486834).

Almost surely, 2^13688999 is an apocalyptic number.

13688999 is a deficient number, since it is larger than the sum of its proper divisors (258337).

13688999 is an equidigital number, since it uses as much as digits as its factorization.

13688999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258336.

The product of its digits is 839808, while the sum is 53.

The square root of 13688999 is about 3699.8647272569. The cubic root of 13688999 is about 239.2161871556.

The spelling of 13688999 in words is "thirteen million, six hundred eighty-eight thousand, nine hundred ninety-nine".