18262218 has 16 divisors (see below), whose sum is σ = 39334176. Its totient is φ = 5619120.

The previous prime is 18262217. The next prime is 18262243. The reversal of 18262218 is 81226281.

It is not an unprimeable number, because it can be changed into a prime (18262213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116988 + ... + 117143.

It is an arithmetic number, because the mean of its divisors is an integer number (2458386).

Almost surely, 2^18262218 is an apocalyptic number.

18262218 is an abundant number, since it is smaller than the sum of its proper divisors (21071958).

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

18262218 is a wasteful number, since it uses less digits than its factorization.

18262218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234149.

The product of its digits is 3072, while the sum is 30.

The square root of 18262218 is about 4273.4316421349. The cubic root of 18262218 is about 263.3406122363.

Adding to 18262218 its reverse (81226281), we get a palindrome (99488499).

The spelling of 18262218 in words is "eighteen million, two hundred sixty-two thousand, two hundred eighteen".