218843 has 2 divisors, whose sum is σ = 218844. Its totient is φ = 218842.

The previous prime is 218839. The next prime is 218849. The reversal of 218843 is 348812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218843 - 2² = 218839 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (218849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109421 + 109422.

It is an arithmetic number, because the mean of its divisors is an integer number (109422).

2²¹⁸⁸⁴³ is an apocalyptic number.

218843 is a deficient number, since it is larger than the sum of its proper divisors (1).

218843 is an equidigital number, since it uses as much as digits as its factorization.

218843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 26.

The square root of 218843 is about 467.8065839639. The cubic root of 218843 is about 60.2620941843.

The spelling of 218843 in words is "two hundred eighteen thousand, eight hundred forty-three".