218889 has 24 divisors (see below), whose sum is σ = 361760. Its totient is φ = 130680.

The previous prime is 218887. The next prime is 218923. The reversal of 218889 is 988812.

218889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218889 - 2¹ = 218887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (218887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3234 + ... + 3300.

2²¹⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

218889 is a deficient number, since it is larger than the sum of its proper divisors (142871).

218889 is a wasteful number, since it uses less digits than its factorization.

218889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 81 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 218889 is about 467.8557469990. The cubic root of 218889 is about 60.2663161793.

The spelling of 218889 in words is "two hundred eighteen thousand, eight hundred eighty-nine".