18357218 has 16 divisors (see below), whose sum is σ = 30533760. Its totient is φ = 8206800.

The previous prime is 18357191. The next prime is 18357257. The reversal of 18357218 is 81275381.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5498 + ... + 8181.

It is an arithmetic number, because the mean of its divisors is an integer number (1908360).

Almost surely, 2^18357218 is an apocalyptic number.

18357218 is a deficient number, since it is larger than the sum of its proper divisors (12176542).

18357218 is a wasteful number, since it uses less digits than its factorization.

18357218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13753.

The product of its digits is 13440, while the sum is 35.

The square root of 18357218 is about 4284.5324132278. The cubic root of 18357218 is about 263.7964550593.

The spelling of 18357218 in words is "eighteen million, three hundred fifty-seven thousand, two hundred eighteen".