218842 has 16 divisors (see below), whose sum is σ = 372960. Its totient is φ = 95472.

The previous prime is 218839. The next prime is 218843. The reversal of 218842 is 248812.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (218843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273 + ... + 715.

It is an arithmetic number, because the mean of its divisors is an integer number (23310).

2²¹⁸⁸⁴² is an apocalyptic number.

218842 is a deficient number, since it is larger than the sum of its proper divisors (154118).

218842 is a wasteful number, since it uses less digits than its factorization.

218842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477.

The product of its digits is 1024, while the sum is 25.

The square root of 218842 is about 467.8055151449. The cubic root of 218842 is about 60.2620023953.

The spelling of 218842 in words is "two hundred eighteen thousand, eight hundred forty-two".