218838223 has 4 divisors (see below), whose sum is σ = 223927528. Its totient is φ = 213748920.

The previous prime is 218838211. The next prime is 218838227. The reversal of 218838223 is 322838812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218838223 - 2²¹ = 216741071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218838227) 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, 2544588 + ... + 2544673.

It is an arithmetic number, because the mean of its divisors is an integer number (55981882).

Almost surely, 2^218838223 is an apocalyptic number.

218838223 is a deficient number, since it is larger than the sum of its proper divisors (5089305).

218838223 is an equidigital number, since it uses as much as digits as its factorization.

218838223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5089304.

The product of its digits is 36864, while the sum is 37.

The square root of 218838223 is about 14793.1816388497. The cubic root of 218838223 is about 602.6165570543.

The spelling of 218838223 in words is "two hundred eighteen million, eight hundred thirty-eight thousand, two hundred twenty-three".