538218 has 16 divisors (see below), whose sum is σ = 1196160. Its totient is φ = 179388.

The previous prime is 538201. The next prime is 538247. The reversal of 538218 is 812835.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 538191 and 538200.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 538218.

It is an unprimeable number.

538218 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 7 ways as a sum of consecutive naturals, for example, 4930 + ... + 5037.

It is an arithmetic number, because the mean of its divisors is an integer number (74760).

2⁵³⁸²¹⁸ is an apocalyptic number.

538218 is an abundant number, since it is smaller than the sum of its proper divisors (657942).

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

538218 is a wasteful number, since it uses less digits than its factorization.

538218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978 (or 9972 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 538218 is about 733.6334234480. The cubic root of 538218 is about 81.3428540021.

The spelling of 538218 in words is "five hundred thirty-eight thousand, two hundred eighteen".