18663222 has 8 divisors (see below), whose sum is σ = 37326456. Its totient is φ = 6221072.

The previous prime is 18663217. The next prime is 18663233. The reversal of 18663222 is 22236681.

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

18663222 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18663222.

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, 1555263 + ... + 1555274.

It is an arithmetic number, because the mean of its divisors is an integer number (4665807).

Almost surely, 2^18663222 is an apocalyptic number.

18663222 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.

18663222 is a wasteful number, since it uses less digits than its factorization.

18663222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110542.

The product of its digits is 6912, while the sum is 30.

The square root of 18663222 is about 4320.0951378413. The cubic root of 18663222 is about 265.2541622301.

The spelling of 18663222 in words is "eighteen million, six hundred sixty-three thousand, two hundred twenty-two".