218394 has 24 divisors (see below), whose sum is σ = 516672. Its totient is φ = 66120.

The previous prime is 218389. The next prime is 218401. The reversal of 218394 is 493812.

218394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an unprimeable number.

218394 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 11 ways as a sum of consecutive naturals, for example, 354 + ... + 749.

It is an arithmetic number, because the mean of its divisors is an integer number (21528).

2²¹⁸³⁹⁴ is an apocalyptic number.

218394 is an abundant number, since it is smaller than the sum of its proper divisors (298278).

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

218394 is a wasteful number, since it uses less digits than its factorization.

218394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1119 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 218394 is about 467.3264383704. The cubic root of 218394 is about 60.2208527370.

The spelling of 218394 in words is "two hundred eighteen thousand, three hundred ninety-four".