218585812 has 12 divisors (see below), whose sum is σ = 387134496. Its totient is φ = 107975960.

The previous prime is 218585797. The next prime is 218585819.

218585812 is nontrivially palindromic in base 10.

218585812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218585819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328864 + ... + 329527.

It is an arithmetic number, because the mean of its divisors is an integer number (32261208).

Almost surely, 2^218585812 is an apocalyptic number.

It is an amenable number.

218585812 is a deficient number, since it is larger than the sum of its proper divisors (168548684).

218585812 is a wasteful number, since it uses less digits than its factorization.

218585812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658478 (or 658476 counting only the distinct ones).

The product of its digits is 51200, while the sum is 40.

The square root of 218585812 is about 14784.6478483595. The cubic root of 218585812 is about 602.3847791927.

The spelling of 218585812 in words is "two hundred eighteen million, five hundred eighty-five thousand, eight hundred twelve".