13692809 has 4 divisors (see below), whose sum is σ = 14746116. Its totient is φ = 12639504.

The previous prime is 13692799. The next prime is 13692841. The reversal of 13692809 is 90829631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2166784 + 11526025 = 1472^2 + 3395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13692809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13692859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526634 + ... + 526659.

It is an arithmetic number, because the mean of its divisors is an integer number (3686529).

Almost surely, 2^13692809 is an apocalyptic number.

It is an amenable number.

13692809 is a deficient number, since it is larger than the sum of its proper divisors (1053307).

13692809 is a wasteful number, since it uses less digits than its factorization.

13692809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053306.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 13692809 is about 3700.3795751247. The cubic root of 13692809 is about 239.2383784332.

It can be divided in two parts, 1369 and 2809, that multiplied together give a square (3845521 = 1961²).

The spelling of 13692809 in words is "thirteen million, six hundred ninety-two thousand, eight hundred nine".