19218 has 8 divisors (see below), whose sum is σ = 38448. Its totient is φ = 6404.

The previous prime is 19213. The next prime is 19219. The reversal of 19218 is 81291.

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

19218 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 19194 and 19203.

It is not an unprimeable number, because it can be changed into a prime (19211) by changing a digit.

19218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1596 + ... + 1607.

It is an arithmetic number, because the mean of its divisors is an integer number (4806).

2¹⁹²¹⁸ is an apocalyptic number.

19218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19224).

19218 is a wasteful number, since it uses less digits than its factorization.

19218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208.

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

The square root of 19218 is about 138.6290012948. The cubic root of 19218 is about 26.7856833016.

It can be divided in two parts, 192 and 18, that added together give a triangular number (210 = T₂₀).

The spelling of 19218 in words is "nineteen thousand, two hundred eighteen".