16218 has 24 divisors (see below), whose sum is σ = 37908. Its totient is φ = 4992.

The previous prime is 16217. The next prime is 16223. The reversal of 16218 is 81261.

It can be written as a sum of positive squares in 2 ways, for example, as 15129 + 1089 = 123^2 + 33^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 16218.

It is not an unprimeable number, because it can be changed into a prime (16217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280 + ... + 332.

2¹⁶²¹⁸ is an apocalyptic number.

16218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18954).

16218 is an abundant number, since it is smaller than the sum of its proper divisors (21690).

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

16218 is a wasteful number, since it uses less digits than its factorization.

16218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 75 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 16218 is about 127.3499116607. The cubic root of 16218 is about 25.3123479643.

Adding to 16218 its reverse (81261), we get a palindrome (97479).

It can be divided in two parts, 162 and 18, that multiplied together give a square (2916 = 54²).

The spelling of 16218 in words is "sixteen thousand, two hundred eighteen".