18219 has 4 divisors (see below), whose sum is σ = 24296. Its totient is φ = 12144.

The previous prime is 18217. The next prime is 18223. The reversal of 18219 is 91281.

18219 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91281 = 3 ⋅30427.

It is not a de Polignac number, because 18219 - 2¹ = 18217 is a prime.

It is a super-2 number, since 2×18219² = 663863922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 18195 and 18204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211) 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, 3034 + ... + 3039.

It is an arithmetic number, because the mean of its divisors is an integer number (6074).

2¹⁸²¹⁹ is an apocalyptic number.

18219 is a deficient number, since it is larger than the sum of its proper divisors (6077).

18219 is an equidigital number, since it uses as much as digits as its factorization.

18219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076.

The product of its digits is 144, while the sum is 21.

The square root of 18219 is about 134.9777759485. The cubic root of 18219 is about 26.3132714082.

It can be divided in two parts, 1821 and 9, that added together give a triangular number (1830 = T₆₀).

The spelling of 18219 in words is "eighteen thousand, two hundred nineteen".