18219218 has 8 divisors (see below), whose sum is σ = 27537840. Its totient is φ = 9039940.

The previous prime is 18219203. The next prime is 18219251. The reversal of 18219218 is 81291281.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 34508 + ... + 35031.

It is an arithmetic number, because the mean of its divisors is an integer number (3442230).

Almost surely, 2^18219218 is an apocalyptic number.

18219218 is a deficient number, since it is larger than the sum of its proper divisors (9318622).

18219218 is a wasteful number, since it uses less digits than its factorization.

18219218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69672.

The product of its digits is 2304, while the sum is 32.

The square root of 18219218 is about 4268.3975916027. The cubic root of 18219218 is about 263.1337635852.

The spelling of 18219218 in words is "eighteen million, two hundred nineteen thousand, two hundred eighteen".