18518212 has 12 divisors (see below), whose sum is σ = 32956560. Its totient is φ = 9102056.

The previous prime is 18518209. The next prime is 18518231. The reversal of 18518212 is 21281581.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38998 + ... + 39469.

It is an arithmetic number, because the mean of its divisors is an integer number (2746380).

Almost surely, 2^18518212 is an apocalyptic number.

It is an amenable number.

18518212 is a deficient number, since it is larger than the sum of its proper divisors (14438348).

18518212 is a wasteful number, since it uses less digits than its factorization.

18518212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78530 (or 78528 counting only the distinct ones).

The product of its digits is 1280, while the sum is 28.

The square root of 18518212 is about 4303.2792147385. The cubic root of 18518212 is about 264.5653822832.

Adding to 18518212 its reverse (21281581), we get a palindrome (39799793).

The spelling of 18518212 in words is "eighteen million, five hundred eighteen thousand, two hundred twelve".