218604 has 12 divisors (see below), whose sum is σ = 510104. Its totient is φ = 72864.

The previous prime is 218599. The next prime is 218611. The reversal of 218604 is 406812.

218604 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9097 + ... + 9120.

2²¹⁸⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

218604 is an abundant number, since it is smaller than the sum of its proper divisors (291500).

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

218604 is a wasteful number, since it uses less digits than its factorization.

218604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18224 (or 18222 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 218604 is about 467.5510667296. The cubic root of 218604 is about 60.2401486392.

The spelling of 218604 in words is "two hundred eighteen thousand, six hundred four".