218782226 has 16 divisors (see below), whose sum is σ = 372019200. Its totient is φ = 95661648.

The previous prime is 218782217. The next prime is 218782229. The reversal of 218782226 is 622287812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 218782226.

It is not an unprimeable number, because it can be changed into a prime (218782229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220946 + ... + 221933.

It is an arithmetic number, because the mean of its divisors is an integer number (23251200).

Almost surely, 2^218782226 is an apocalyptic number.

218782226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

218782226 is a deficient number, since it is larger than the sum of its proper divisors (153236974).

218782226 is a wasteful number, since it uses less digits than its factorization.

218782226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442913.

The product of its digits is 43008, while the sum is 38.

The square root of 218782226 is about 14791.2888552688. The cubic root of 218782226 is about 602.5651528746.

The spelling of 218782226 in words is "two hundred eighteen million, seven hundred eighty-two thousand, two hundred twenty-six".