18466218 has 20 divisors (see below), whose sum is σ = 41378370. Its totient is φ = 6155352.

The previous prime is 18466213. The next prime is 18466229. The reversal of 18466218 is 81266481.

It can be written as a sum of positive squares in only one way, i.e., 11512449 + 6953769 = 3393^2 + 2637^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18466213) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 56833 + ... + 57156.

Almost surely, 2^18466218 is an apocalyptic number.

18466218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18466218 is an abundant number, since it is smaller than the sum of its proper divisors (22912152).

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

18466218 is a wasteful number, since it uses less digits than its factorization.

18466218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114003 (or 113994 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18466218 is about 4297.2337613865. The cubic root of 18466218 is about 264.3175414590.

The spelling of 18466218 in words is "eighteen million, four hundred sixty-six thousand, two hundred eighteen".