218400222 has 8 divisors (see below), whose sum is σ = 436800456. Its totient is φ = 72800072.

The previous prime is 218400181. The next prime is 218400263. The reversal of 218400222 is 222004812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218400181) and next prime (218400263).

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

218400222 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18200013 + ... + 18200024.

It is an arithmetic number, because the mean of its divisors is an integer number (54600057).

Almost surely, 2^218400222 is an apocalyptic number.

218400222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

218400222 is a wasteful number, since it uses less digits than its factorization.

218400222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36400042.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 218400222 is about 14778.3700725080. The cubic root of 218400222 is about 602.2142462483.

The spelling of 218400222 in words is "two hundred eighteen million, four hundred thousand, two hundred twenty-two".