218244 has 24 divisors (see below), whose sum is σ = 548800. Its totient is φ = 67104.

The previous prime is 218233. The next prime is 218249. The reversal of 218244 is 442812.

It is a self number, because there is not a number n which added to its sum of digits gives 218244.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218244.

It is not an unprimeable number, because it can be changed into a prime (218249) by changing a digit.

218244 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544 + ... + 855.

2²¹⁸²⁴⁴ is an apocalyptic number.

It is an amenable number.

218244 is an abundant number, since it is smaller than the sum of its proper divisors (330556).

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

218244 is a wasteful number, since it uses less digits than its factorization.

218244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419 (or 1417 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 218244 is about 467.1659234148. The cubic root of 218244 is about 60.2070623753.

The spelling of 218244 in words is "two hundred eighteen thousand, two hundred forty-four".