218318 has 4 divisors (see below), whose sum is σ = 327480. Its totient is φ = 109158.

The previous prime is 218287. The next prime is 218357. The reversal of 218318 is 813812.

218318 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 218293 and 218302.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218318.

It is an unprimeable number.

218318 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 as a sum of consecutive naturals, namely, 54578 + ... + 54581.

It is an arithmetic number, because the mean of its divisors is an integer number (81870).

2²¹⁸³¹⁸ is an apocalyptic number.

218318 is a deficient number, since it is larger than the sum of its proper divisors (109162).

218318 is a wasteful number, since it uses less digits than its factorization.

218318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109161.

The product of its digits is 384, while the sum is 23.

The square root of 218318 is about 467.2451176845. The cubic root of 218318 is about 60.2138664099.

The spelling of 218318 in words is "two hundred eighteen thousand, three hundred eighteen".