18258218 has 16 divisors (see below), whose sum is σ = 30300480. Its totient is φ = 8181600.

The previous prime is 18258217. The next prime is 18258239. The reversal of 18258218 is 81285281.

It is not an unprimeable number, because it can be changed into a prime (18258217) by changing a digit.

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, 4283 + ... + 7406.

It is an arithmetic number, because the mean of its divisors is an integer number (1893780).

Almost surely, 2^18258218 is an apocalyptic number.

18258218 is a deficient number, since it is larger than the sum of its proper divisors (12042262).

18258218 is a wasteful number, since it uses less digits than its factorization.

18258218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11773.

The product of its digits is 10240, while the sum is 35.

The square root of 18258218 is about 4272.9636085509. The cubic root of 18258218 is about 263.3213842074.

The spelling of 18258218 in words is "eighteen million, two hundred fifty-eight thousand, two hundred eighteen".