18650218 has 16 divisors (see below), whose sum is σ = 28781280. Its totient is φ = 9058896.

The previous prime is 18650213. The next prime is 18650231. The reversal of 18650218 is 81205681.

It is a self number, because there is not a number n which added to its sum of digits gives 18650218.

It is not an unprimeable number, because it can be changed into a prime (18650213) 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, 19221 + ... + 20167.

It is an arithmetic number, because the mean of its divisors is an integer number (1798830).

Almost surely, 2^18650218 is an apocalyptic number.

18650218 is a deficient number, since it is larger than the sum of its proper divisors (10131062).

18650218 is a wasteful number, since it uses less digits than its factorization.

18650218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 18650218 is about 4318.5898161321. The cubic root of 18650218 is about 265.1925407413.

Adding to 18650218 its reverse (81205681), we get a palindrome (99855899).

The spelling of 18650218 in words is "eighteen million, six hundred fifty thousand, two hundred eighteen".