13809018 has 8 divisors (see below), whose sum is σ = 27618048. Its totient is φ = 4603004.

The previous prime is 13809013. The next prime is 13809031. The reversal of 13809018 is 81090831.

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

13809018 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13809011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150746 + ... + 1150757.

It is an arithmetic number, because the mean of its divisors is an integer number (3452256).

Almost surely, 2^13809018 is an apocalyptic number.

13809018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13809018 is a wasteful number, since it uses less digits than its factorization.

13809018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301508.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 13809018 is about 3716.0487079693. The cubic root of 13809018 is about 239.9132672709.

Adding to 13809018 its reverse (81090831), we get a palindrome (94899849).

The spelling of 13809018 in words is "thirteen million, eight hundred nine thousand, eighteen".