9218 has 8 divisors (see below), whose sum is σ = 15120. Its totient is φ = 4180.

The previous prime is 9209. The next prime is 9221. The reversal of 9218 is 8129.

9218 = 22² + 23² + ... + 33².

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 9218.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 9218.

It is an unprimeable number.

9218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188 + ... + 231.

It is an arithmetic number, because the mean of its divisors is an integer number (1890).

2⁹²¹⁸ is an apocalyptic number.

9218 is a deficient number, since it is larger than the sum of its proper divisors (5902).

9218 is a wasteful number, since it uses less digits than its factorization.

9218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 144, while the sum is 20.

The square root of 9218 is about 96.0104161016. The cubic root of 9218 is about 20.9674476767.

Subtracting from 9218 its reverse (8129), we obtain a square (1089 = 33²).

It can be divided in two parts, 921 and 8, that added together give a palindrome (929).

The spelling of 9218 in words is "nine thousand, two hundred eighteen".