18202218 has 8 divisors (see below), whose sum is σ = 36404448. Its totient is φ = 6067404.

The previous prime is 18202213. The next prime is 18202243. The reversal of 18202218 is 81220281.

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

18202218 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18202213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516846 + ... + 1516857.

It is an arithmetic number, because the mean of its divisors is an integer number (4550556).

Almost surely, 2^18202218 is an apocalyptic number.

18202218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18202218 is a wasteful number, since it uses less digits than its factorization.

18202218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033708.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18202218 is about 4266.4057472303. The cubic root of 18202218 is about 263.0518964415.

Adding to 18202218 its reverse (81220281), we get a palindrome (99422499).

The spelling of 18202218 in words is "eighteen million, two hundred two thousand, two hundred eighteen".