218530 has 24 divisors (see below), whose sum is σ = 434196. Its totient is φ = 78720.

The previous prime is 218527. The next prime is 218531. The reversal of 218530 is 35812.

It is a happy number.

218530 is nontrivially palindromic in base 12.

218530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 441 + 218089 = 21^2 + 467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218498 and 218507.

It is not an unprimeable number, because it can be changed into a prime (218531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5310 + ... + 5350.

2²¹⁸⁵³⁰ is an apocalyptic number.

218530 is a deficient number, since it is larger than the sum of its proper divisors (215666).

218530 is a wasteful number, since it uses less digits than its factorization.

218530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 218530 is about 467.4719242906. The cubic root of 218530 is about 60.2333505415.

The spelling of 218530 in words is "two hundred eighteen thousand, five hundred thirty".