18057219 has 4 divisors (see below), whose sum is σ = 24076296. Its totient is φ = 12038144.

The previous prime is 18057203. The next prime is 18057223. The reversal of 18057219 is 91275081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18057219 - 2⁴ = 18057203 is a prime.

It is a super-2 number, since 2×18057219² = 652126316027922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18057219.

It is not an unprimeable number, because it can be changed into a prime (18057289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3009534 + ... + 3009539.

It is an arithmetic number, because the mean of its divisors is an integer number (6019074).

Almost surely, 2^18057219 is an apocalyptic number.

18057219 is a deficient number, since it is larger than the sum of its proper divisors (6019077).

18057219 is an equidigital number, since it uses as much as digits as its factorization.

18057219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6019076.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 18057219 is about 4249.3786604632. The cubic root of 18057219 is about 262.3515423590.

The spelling of 18057219 in words is "eighteen million, fifty-seven thousand, two hundred nineteen".