18408009 has 4 divisors (see below), whose sum is σ = 24544016. Its totient is φ = 12272004.

The previous prime is 18408001. The next prime is 18408023. The reversal of 18408009 is 90080481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18408009 - 2³ = 18408001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18408001) 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, 3067999 + ... + 3068004.

It is an arithmetic number, because the mean of its divisors is an integer number (6136004).

Almost surely, 2^18408009 is an apocalyptic number.

It is an amenable number.

18408009 is a deficient number, since it is larger than the sum of its proper divisors (6136007).

18408009 is an equidigital number, since it uses as much as digits as its factorization.

18408009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136006.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 18408009 is about 4290.4555702163. The cubic root of 18408009 is about 264.0395228936.

The spelling of 18408009 in words is "eighteen million, four hundred eight thousand, nine".