18180218 has 16 divisors (see below), whose sum is σ = 31254144. Its totient is φ = 7769520.

The previous prime is 18180199. The next prime is 18180223. The reversal of 18180218 is 81208181.

It is a Curzon number.

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, 3923 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (1953384).

Almost surely, 2^18180218 is an apocalyptic number.

18180218 is a deficient number, since it is larger than the sum of its proper divisors (13073926).

18180218 is a wasteful number, since it uses less digits than its factorization.

18180218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677.

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 18180218 is about 4263.8266850331. The cubic root of 18180218 is about 262.9458750248.

Adding to 18180218 its reverse (81208181), we get a palindrome (99388399).

The spelling of 18180218 in words is "eighteen million, one hundred eighty thousand, two hundred eighteen".