18219212 has 18 divisors (see below), whose sum is σ = 35046564. Its totient is φ = 8281240.

The previous prime is 18219203. The next prime is 18219251. The reversal of 18219212 is 21291281.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18338 + ... + 19305.

Almost surely, 2^18219212 is an apocalyptic number.

It is an amenable number.

18219212 is a deficient number, since it is larger than the sum of its proper divisors (16827352).

18219212 is a wasteful number, since it uses less digits than its factorization.

18219212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37669 (or 37656 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 18219212 is about 4268.3968887628. The cubic root of 18219212 is about 263.1337346999.

The spelling of 18219212 in words is "eighteen million, two hundred nineteen thousand, two hundred twelve".