18118689 has 4 divisors (see below), whose sum is σ = 24158256. Its totient is φ = 12079124.

The previous prime is 18118669. The next prime is 18118699. The reversal of 18118689 is 98681181.

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 18118689 - 2⁵ = 18118657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18118689.

It is not an unprimeable number, because it can be changed into a prime (18118669) 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, 3019779 + ... + 3019784.

It is an arithmetic number, because the mean of its divisors is an integer number (6039564).

Almost surely, 2^18118689 is an apocalyptic number.

It is an amenable number.

18118689 is a deficient number, since it is larger than the sum of its proper divisors (6039567).

18118689 is an equidigital number, since it uses as much as digits as its factorization.

18118689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039566.

The product of its digits is 27648, while the sum is 42.

The square root of 18118689 is about 4256.6053375900. The cubic root of 18118689 is about 262.6489023677.

The spelling of 18118689 in words is "eighteen million, one hundred eighteen thousand, six hundred eighty-nine".