218285 has 8 divisors (see below), whose sum is σ = 264600. Its totient is φ = 172864.

The previous prime is 218279. The next prime is 218287. The reversal of 218285 is 582812.

It can be written as a sum of positive squares in 4 ways, for example, as 29929 + 188356 = 173^2 + 434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218285 - 2¹² = 214189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599 + ... + 891.

It is an arithmetic number, because the mean of its divisors is an integer number (33075).

2²¹⁸²⁸⁵ is an apocalyptic number.

It is an amenable number.

218285 is a deficient number, since it is larger than the sum of its proper divisors (46315).

218285 is a wasteful number, since it uses less digits than its factorization.

218285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its digits is 1280, while the sum is 26.

The square root of 218285 is about 467.2098029793. The cubic root of 218285 is about 60.2108323682.

The spelling of 218285 in words is "two hundred eighteen thousand, two hundred eighty-five".