13813809 has 8 divisors (see below), whose sum is σ = 19501920. Its totient is φ = 8667456.

The previous prime is 13813801. The next prime is 13813829. The reversal of 13813809 is 90831831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13813809 - 2³ = 13813801 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13813809.

It is not an unprimeable number, because it can be changed into a prime (13813801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135379 + ... + 135480.

It is an arithmetic number, because the mean of its divisors is an integer number (2437740).

Almost surely, 2^13813809 is an apocalyptic number.

It is an amenable number.

13813809 is a deficient number, since it is larger than the sum of its proper divisors (5688111).

13813809 is a wasteful number, since it uses less digits than its factorization.

13813809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270879.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 13813809 is about 3716.6932883949. The cubic root of 13813809 is about 239.9410098074.

The spelling of 13813809 in words is "thirteen million, eight hundred thirteen thousand, eight hundred nine".