218550 has 48 divisors (see below), whose sum is σ = 571392. Its totient is φ = 55200.

The previous prime is 218549. The next prime is 218551. The reversal of 218550 is 55812.

It is an interprime number because it is at equal distance from previous prime (218549) and next prime (218551).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218551) 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 23 ways as a sum of consecutive naturals, for example, 4627 + ... + 4673.

It is an arithmetic number, because the mean of its divisors is an integer number (11904).

2²¹⁸⁵⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285696).

218550 is an abundant number, since it is smaller than the sum of its proper divisors (352842).

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

218550 is a wasteful number, since it uses less digits than its factorization.

218550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 218550 is about 467.4933154602. The cubic root of 218550 is about 60.2351880165.

The spelling of 218550 in words is "two hundred eighteen thousand, five hundred fifty".