218258 has 8 divisors (see below), whose sum is σ = 332940. Its totient is φ = 107280.

The previous prime is 218249. The next prime is 218279. The reversal of 218258 is 852812.

218258 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 218089 + 169 = 467^2 + 13^2 .

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

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218258.

It is an unprimeable number.

218258 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773 + ... + 1016.

2²¹⁸²⁵⁸ is an apocalyptic number.

218258 is a deficient number, since it is larger than the sum of its proper divisors (114682).

218258 is a wasteful number, since it uses less digits than its factorization.

218258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852.

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

The square root of 218258 is about 467.1809071441. The cubic root of 218258 is about 60.2083497430.

The spelling of 218258 in words is "two hundred eighteen thousand, two hundred fifty-eight".