218943 has 24 divisors (see below), whose sum is σ = 353808. Its totient is φ = 134784.

The previous prime is 218941. The next prime is 218947. The reversal of 218943 is 349812.

It is not a de Polignac number, because 218943 - 2¹ = 218941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4105 + ... + 4157.

It is an arithmetic number, because the mean of its divisors is an integer number (14742).

2²¹⁸⁹⁴³ is an apocalyptic number.

218943 is a deficient number, since it is larger than the sum of its proper divisors (134865).

218943 is an equidigital number, since it uses as much as digits as its factorization.

218943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 73 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 218943 is about 467.9134535360. The cubic root of 218943 is about 60.2712716796.

The spelling of 218943 in words is "two hundred eighteen thousand, nine hundred forty-three".