18221179 has 8 divisors (see below), whose sum is σ = 18738720. Its totient is φ = 17707200.

The previous prime is 18221173. The next prime is 18221213. The reversal of 18221179 is 97112281.

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

It is a cyclic number.

It is not a de Polignac number, because 18221179 - 2⁹ = 18220667 is a prime.

It is a super-2 number, since 2×18221179² = 664022728300082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18221179.

It is not an unprimeable number, because it can be changed into a prime (18221173) 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, 12037 + ... + 13465.

It is an arithmetic number, because the mean of its divisors is an integer number (2342340).

Almost surely, 2^18221179 is an apocalyptic number.

18221179 is a deficient number, since it is larger than the sum of its proper divisors (517541).

18221179 is a wasteful number, since it uses less digits than its factorization.

18221179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781.

The product of its digits is 2016, while the sum is 31.

The square root of 18221179 is about 4268.6272969188. The cubic root of 18221179 is about 263.1432039245.

The spelling of 18221179 in words is "eighteen million, two hundred twenty-one thousand, one hundred seventy-nine".