18018618 has 16 divisors (see below), whose sum is σ = 36135936. Its totient is φ = 5989760.

The previous prime is 18018617. The next prime is 18018629. The reversal of 18018618 is 81681081.

It is not an unprimeable number, because it can be changed into a prime (18018617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1623 + ... + 6218.

It is an arithmetic number, because the mean of its divisors is an integer number (2258496).

Almost surely, 2^18018618 is an apocalyptic number.

18018618 is an abundant number, since it is smaller than the sum of its proper divisors (18117318).

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

18018618 is a wasteful number, since it uses less digits than its factorization.

18018618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229.

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 18018618 is about 4244.8342723833. The cubic root of 18018618 is about 262.1644656250.

Adding to 18018618 its reverse (81681081), we get a palindrome (99699699).

The spelling of 18018618 in words is "eighteen million, eighteen thousand, six hundred eighteen".