18108659 has 4 divisors (see below), whose sum is σ = 18896016. Its totient is φ = 17321304.

The previous prime is 18108647. The next prime is 18108667. The reversal of 18108659 is 95680181.

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

It is a cyclic number.

It is not a de Polignac number, because 18108659 - 2²⁰ = 17060083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18101659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393644 + ... + 393689.

It is an arithmetic number, because the mean of its divisors is an integer number (4724004).

Almost surely, 2^18108659 is an apocalyptic number.

18108659 is a deficient number, since it is larger than the sum of its proper divisors (787357).

18108659 is an equidigital number, since it uses as much as digits as its factorization.

18108659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787356.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18108659 is about 4255.4270056012. The cubic root of 18108659 is about 262.6004283906.

The spelling of 18108659 in words is "eighteen million, one hundred eight thousand, six hundred fifty-nine".