18522218 has 16 divisors (see below), whose sum is σ = 32641056. Its totient is φ = 7771440.

The previous prime is 18522211. The next prime is 18522233. The reversal of 18522218 is 81222581.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18522211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32096 + ... + 32667.

It is an arithmetic number, because the mean of its divisors is an integer number (2040066).

Almost surely, 2^18522218 is an apocalyptic number.

18522218 is a deficient number, since it is larger than the sum of its proper divisors (14118838).

18522218 is a wasteful number, since it uses less digits than its factorization.

18522218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64789.

The product of its digits is 2560, while the sum is 29.

The square root of 18522218 is about 4303.7446485590. The cubic root of 18522218 is about 264.5844585040.

Adding to 18522218 its reverse (81222581), we get a palindrome (99744799).

The spelling of 18522218 in words is "eighteen million, five hundred twenty-two thousand, two hundred eighteen".