18111212 has 24 divisors (see below), whose sum is σ = 37798656. Its totient is φ = 7424208.

The previous prime is 18111187. The next prime is 18111229. The reversal of 18111212 is 21211181.

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, 13418 + ... + 14705.

It is an arithmetic number, because the mean of its divisors is an integer number (1574944).

Almost surely, 2^18111212 is an apocalyptic number.

It is an amenable number.

18111212 is an abundant number, since it is smaller than the sum of its proper divisors (19687444).

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

18111212 is a wasteful number, since it uses less digits than its factorization.

18111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28157 (or 28155 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

The square root of 18111212 is about 4255.7269649262. The cubic root of 18111212 is about 262.6127684796.

Adding to 18111212 its reverse (21211181), we get a palindrome (39322393).

The spelling of 18111212 in words is "eighteen million, one hundred eleven thousand, two hundred twelve".