18004218 has 16 divisors (see below), whose sum is σ = 36091776. Its totient is φ = 5987520.

The previous prime is 18004213. The next prime is 18004249. The reversal of 18004218 is 81240081.

It is not an unprimeable number, because it can be changed into a prime (18004213) 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 7 ways as a sum of consecutive naturals, for example, 463 + ... + 6018.

It is an arithmetic number, because the mean of its divisors is an integer number (2255736).

Almost surely, 2^18004218 is an apocalyptic number.

18004218 is an abundant number, since it is smaller than the sum of its proper divisors (18087558).

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

18004218 is a wasteful number, since it uses less digits than its factorization.

18004218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949.

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

The square root of 18004218 is about 4243.1377540683. The cubic root of 18004218 is about 262.0946087243.

Adding to 18004218 its reverse (81240081), we get a palindrome (99244299).

The spelling of 18004218 in words is "eighteen million, four thousand, two hundred eighteen".