18198218 has 8 divisors (see below), whose sum is σ = 27478560. Its totient is φ = 9038700.

The previous prime is 18198217. The next prime is 18198247. The reversal of 18198218 is 81289181.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (18198217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29828 + ... + 30431.

It is an arithmetic number, because the mean of its divisors is an integer number (3434820).

Almost surely, 2^18198218 is an apocalyptic number.

18198218 is a deficient number, since it is larger than the sum of its proper divisors (9280342).

18198218 is a wasteful number, since it uses less digits than its factorization.

18198218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60412.

The product of its digits is 9216, while the sum is 38.

The square root of 18198218 is about 4265.9369428064. The cubic root of 18198218 is about 263.0326261770.

The spelling of 18198218 in words is "eighteen million, one hundred ninety-eight thousand, two hundred eighteen".