218004 has 24 divisors (see below), whose sum is σ = 523488. Its totient is φ = 70560.

The previous prime is 218003. The next prime is 218021. The reversal of 218004 is 400812.

218004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199 + ... + 689.

It is an arithmetic number, because the mean of its divisors is an integer number (21812).

2²¹⁸⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

218004 is an abundant number, since it is smaller than the sum of its proper divisors (305484).

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

218004 is a wasteful number, since it uses less digits than its factorization.

218004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 218004 is about 466.9089847069. The cubic root of 218004 is about 60.1849846474.

Adding to 218004 its reverse (400812), we get a palindrome (618816).

The spelling of 218004 in words is "two hundred eighteen thousand, four".