18102218 has 8 divisors (see below), whose sum is σ = 27497280. Its totient is φ = 8936460.

The previous prime is 18102211. The next prime is 18102239. The reversal of 18102218 is 81220181.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 18102193 and 18102202.

It is not an unprimeable number, because it can be changed into a prime (18102211) 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, 57128 + ... + 57443.

It is an arithmetic number, because the mean of its divisors is an integer number (3437160).

Almost surely, 2^18102218 is an apocalyptic number.

18102218 is a deficient number, since it is larger than the sum of its proper divisors (9395062).

18102218 is a wasteful number, since it uses less digits than its factorization.

18102218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114652.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 18102218 is about 4254.6701399756. The cubic root of 18102218 is about 262.5692902495.

Adding to 18102218 its reverse (81220181), we get a palindrome (99322399).

The spelling of 18102218 in words is "eighteen million, one hundred two thousand, two hundred eighteen".