18103218 has 16 divisors (see below), whose sum is σ = 41378880. Its totient is φ = 5172336.

The previous prime is 18103201. The next prime is 18103237. The reversal of 18103218 is 81230181.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215473 + ... + 215556.

It is an arithmetic number, because the mean of its divisors is an integer number (2586180).

Almost surely, 2^18103218 is an apocalyptic number.

18103218 is an abundant number, since it is smaller than the sum of its proper divisors (23275662).

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

18103218 is a wasteful number, since it uses less digits than its factorization.

18103218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431041.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18103218 is about 4254.7876562762. The cubic root of 18103218 is about 262.5741250982.

Adding to 18103218 its reverse (81230181), we get a palindrome (99333399).

The spelling of 18103218 in words is "eighteen million, one hundred three thousand, two hundred eighteen".