218690885 has 16 divisors (see below), whose sum is σ = 310262400. Its totient is φ = 144787776.

The previous prime is 218690869. The next prime is 218690887. The reversal of 218690885 is 588096812.

It is not a de Polignac number, because 218690885 - 2⁴ = 218690869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218690887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106715 + ... + 108744.

It is an arithmetic number, because the mean of its divisors is an integer number (19391400).

Almost surely, 2^218690885 is an apocalyptic number.

It is an amenable number.

218690885 is a deficient number, since it is larger than the sum of its proper divisors (91571515).

218690885 is a wasteful number, since it uses less digits than its factorization.

218690885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215500.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 218690885 is about 14788.2008709647. The cubic root of 218690885 is about 602.4812847501.

The spelling of 218690885 in words is "two hundred eighteen million, six hundred ninety thousand, eight hundred eighty-five".