18000418 has 4 divisors (see below), whose sum is σ = 27000630. Its totient is φ = 9000208.

The previous prime is 18000407. The next prime is 18000439. The reversal of 18000418 is 81400081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12369289 + 5631129 = 3517^2 + 2373^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500103 + ... + 4500106.

Almost surely, 2^18000418 is an apocalyptic number.

18000418 is a deficient number, since it is larger than the sum of its proper divisors (9000212).

18000418 is an equidigital number, since it uses as much as digits as its factorization.

18000418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000211.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 18000418 is about 4242.6899486057. The cubic root of 18000418 is about 262.0761680532.

Adding to 18000418 its reverse (81400081), we get a palindrome (99400499).

The spelling of 18000418 in words is "eighteen million, four hundred eighteen", and thus it is an aban number.