18870218 has 16 divisors (see below), whose sum is σ = 29203200. Its totient is φ = 9140016.

The previous prime is 18870217. The next prime is 18870233. The reversal of 18870218 is 81207881.

It is not an unprimeable number, because it can be changed into a prime (18870217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8708 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (1825200).

Almost surely, 2^18870218 is an apocalyptic number.

18870218 is a deficient number, since it is larger than the sum of its proper divisors (10332982).

18870218 is a wasteful number, since it uses less digits than its factorization.

18870218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 18870218 is about 4343.9864180266. The cubic root of 18870218 is about 266.2312139684.

The spelling of 18870218 in words is "eighteen million, eight hundred seventy thousand, two hundred eighteen".