218922 has 32 divisors (see below), whose sum is σ = 497664. Its totient is φ = 63600.

The previous prime is 218887. The next prime is 218923. The reversal of 218922 is 229812.

It is a junction number, because it is equal to n+sod(n) for n = 218892 and 218901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218923) by changing a digit.

218922 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 15 ways as a sum of consecutive naturals, for example, 1993 + ... + 2099.

It is an arithmetic number, because the mean of its divisors is an integer number (15552).

2²¹⁸⁹²² is an apocalyptic number.

218922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 218922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248832).

218922 is an abundant number, since it is smaller than the sum of its proper divisors (278742).

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

218922 is a wasteful number, since it uses less digits than its factorization.

218922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154.

The product of its digits is 576, while the sum is 24.

The square root of 218922 is about 467.8910129507. The cubic root of 218922 is about 60.2693446374.

It can be divided in two parts, 2189 and 22, that added together give a triangular number (2211 = T₆₆).

The spelling of 218922 in words is "two hundred eighteen thousand, nine hundred twenty-two".