218859 has 4 divisors (see below), whose sum is σ = 291816. Its totient is φ = 145904.

The previous prime is 218857. The next prime is 218873. The reversal of 218859 is 958812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218859 - 2¹ = 218857 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (218857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36474 + ... + 36479.

It is an arithmetic number, because the mean of its divisors is an integer number (72954).

2²¹⁸⁸⁵⁹ is an apocalyptic number.

218859 is a deficient number, since it is larger than the sum of its proper divisors (72957).

218859 is an equidigital number, since it uses as much as digits as its factorization.

218859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72956.

The product of its digits is 5760, while the sum is 33.

The square root of 218859 is about 467.8236847360. The cubic root of 218859 is about 60.2635627714.

The spelling of 218859 in words is "two hundred eighteen thousand, eight hundred fifty-nine".