18111618 has 24 divisors (see below), whose sum is σ = 44848128. Its totient is φ = 5174712.

The previous prime is 18111601. The next prime is 18111629. The reversal of 18111618 is 81611181.

It is a junction number, because it is equal to n+sod(n) for n = 18111591 and 18111600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71746 + ... + 71997.

It is an arithmetic number, because the mean of its divisors is an integer number (1868672).

Almost surely, 2^18111618 is an apocalyptic number.

18111618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18111618 is an abundant number, since it is smaller than the sum of its proper divisors (26736510).

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

18111618 is a wasteful number, since it uses less digits than its factorization.

18111618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143758 (or 143755 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 18111618 is about 4255.7746650874. The cubic root of 18111618 is about 262.6147307997.

Adding to 18111618 its reverse (81611181), we get a palindrome (99722799).

The spelling of 18111618 in words is "eighteen million, one hundred eleven thousand, six hundred eighteen".