218844 has 18 divisors (see below), whose sum is σ = 553280. Its totient is φ = 72936.

The previous prime is 218843. The next prime is 218849. The reversal of 218844 is 448812.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3004 + ... + 3075.

2²¹⁸⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

218844 is an abundant number, since it is smaller than the sum of its proper divisors (334436).

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

218844 is a wasteful number, since it uses less digits than its factorization.

218844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089 (or 6084 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 218844 is about 467.8076527805. The cubic root of 218844 is about 60.2621859731.

The spelling of 218844 in words is "two hundred eighteen thousand, eight hundred forty-four".