218979 has 12 divisors (see below), whose sum is σ = 327600. Its totient is φ = 140784.

The previous prime is 218971. The next prime is 218987. The reversal of 218979 is 979812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218971) and next prime (218987).

It is not a de Polignac number, because 218979 - 2³ = 218971 is a prime.

218979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (218971) 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 11 ways as a sum of consecutive naturals, for example, 159 + ... + 680.

It is an arithmetic number, because the mean of its divisors is an integer number (27300).

2²¹⁸⁹⁷⁹ is an apocalyptic number.

218979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

218979 is a deficient number, since it is larger than the sum of its proper divisors (108621).

218979 is a wasteful number, since it uses less digits than its factorization.

218979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 871 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 218979 is about 467.9519206072. The cubic root of 218979 is about 60.2745748937.

It can be divided in two parts, 2 and 18979, that added together give a palindrome (18981).

The spelling of 218979 in words is "two hundred eighteen thousand, nine hundred seventy-nine".