218491226 has 8 divisors (see below), whose sum is σ = 328602720. Its totient is φ = 108956988.

The previous prime is 218491223. The next prime is 218491261. The reversal of 218491226 is 622194812.

218491226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (218491223) 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, 143366 + ... + 144881.

It is an arithmetic number, because the mean of its divisors is an integer number (41075340).

Almost surely, 2^218491226 is an apocalyptic number.

218491226 is a deficient number, since it is larger than the sum of its proper divisors (110111494).

218491226 is a wasteful number, since it uses less digits than its factorization.

218491226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288628.

The product of its digits is 13824, while the sum is 35.

The square root of 218491226 is about 14781.4487111379. The cubic root of 218491226 is about 602.2978790923.

The spelling of 218491226 in words is "two hundred eighteen million, four hundred ninety-one thousand, two hundred twenty-six".