18222444 has 36 divisors (see below), whose sum is σ = 48488440. Its totient is φ = 5754240.

The previous prime is 18222443. The next prime is 18222461. The reversal of 18222444 is 44422281.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18222443) 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 11 ways as a sum of consecutive naturals, for example, 12637 + ... + 14004.

Almost surely, 2^18222444 is an apocalyptic number.

It is an amenable number.

18222444 is an abundant number, since it is smaller than the sum of its proper divisors (30265996).

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

18222444 is a wasteful number, since it uses less digits than its factorization.

18222444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26670 (or 26665 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

The square root of 18222444 is about 4268.7754684453. The cubic root of 18222444 is about 263.1492933301.

The spelling of 18222444 in words is "eighteen million, two hundred twenty-two thousand, four hundred forty-four".