218906889 has 16 divisors (see below), whose sum is σ = 297480960. Its totient is φ = 143154000.

The previous prime is 218906887. The next prime is 218906899. The reversal of 218906889 is 988609812.

It is not a de Polignac number, because 218906889 - 2¹ = 218906887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218906887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48282 + ... + 52620.

It is an arithmetic number, because the mean of its divisors is an integer number (18592560).

Almost surely, 2^218906889 is an apocalyptic number.

It is an amenable number.

218906889 is a deficient number, since it is larger than the sum of its proper divisors (78574071).

218906889 is a wasteful number, since it uses less digits than its factorization.

218906889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660.

The product of its (nonzero) digits is 497664, while the sum is 51.

The square root of 218906889 is about 14795.5023233414. The cubic root of 218906889 is about 602.6795791668.

The spelling of 218906889 in words is "two hundred eighteen million, nine hundred six thousand, eight hundred eighty-nine".