218873 has 2 divisors, whose sum is σ = 218874. Its totient is φ = 218872.

The previous prime is 218857. The next prime is 218887. The reversal of 218873 is 378812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218089 + 784 = 467^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 218873 - 2⁴ = 218857 is a prime.

It is not a weakly prime, because it can be changed into another prime (218833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109436 + 109437.

It is an arithmetic number, because the mean of its divisors is an integer number (109437).

2²¹⁸⁸⁷³ is an apocalyptic number.

It is an amenable number.

218873 is a deficient number, since it is larger than the sum of its proper divisors (1).

218873 is an equidigital number, since it uses as much as digits as its factorization.

218873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 218873 is about 467.8386473989. The cubic root of 218873 is about 60.2648477264.

The spelling of 218873 in words is "two hundred eighteen thousand, eight hundred seventy-three".