18418117 has 4 divisors (see below), whose sum is σ = 18441216. Its totient is φ = 18395020.

The previous prime is 18418111. The next prime is 18418133. The reversal of 18418117 is 71181481.

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 a cyclic number.

It is not a de Polignac number, because 18418117 - 2³ = 18418109 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418111) 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, 10309 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (4610304).

Almost surely, 2^18418117 is an apocalyptic number.

It is an amenable number.

18418117 is a deficient number, since it is larger than the sum of its proper divisors (23099).

18418117 is an equidigital number, since it uses as much as digits as its factorization.

18418117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23098.

The product of its digits is 1792, while the sum is 31.

The square root of 18418117 is about 4291.6333720391. The cubic root of 18418117 is about 264.0878428602.

Adding to 18418117 its reverse (71181481), we get a palindrome (89599598).

The spelling of 18418117 in words is "eighteen million, four hundred eighteen thousand, one hundred seventeen".