218888889 has 16 divisors (see below), whose sum is σ = 310109760. Its totient is φ = 137332800.

The previous prime is 218888869. The next prime is 218888893. The reversal of 218888889 is 988888812.

It is not a de Polignac number, because 218888889 - 2¹² = 218884793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218888809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7314 + ... + 22164.

It is an arithmetic number, because the mean of its divisors is an integer number (19381860).

Almost surely, 2^218888889 is an apocalyptic number.

It is an amenable number.

218888889 is a deficient number, since it is larger than the sum of its proper divisors (91220871).

218888889 is an equidigital number, since it uses as much as digits as its factorization.

218888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14905 (or 14871 counting only the distinct ones).

The product of its digits is 4718592, while the sum is 60.

The square root of 218888889 is about 14794.8940178698. The cubic root of 218888889 is about 602.6630599215.

The spelling of 218888889 in words is "two hundred eighteen million, eight hundred eighty-eight thousand, eight hundred eighty-nine".