218507226 has 16 divisors (see below), whose sum is σ = 499445184. Its totient is φ = 62430624.

The previous prime is 218507213. The next prime is 218507231. The reversal of 218507226 is 622705812.

218507226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2601235 + ... + 2601318.

It is an arithmetic number, because the mean of its divisors is an integer number (31215324).

Almost surely, 2^218507226 is an apocalyptic number.

218507226 is an abundant number, since it is smaller than the sum of its proper divisors (280937958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218507226 is a wasteful number, since it uses less digits than its factorization.

218507226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5202565.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 218507226 is about 14781.9899201697. The cubic root of 218507226 is about 602.3125807213.

The spelling of 218507226 in words is "two hundred eighteen million, five hundred seven thousand, two hundred twenty-six".