18822321 has 48 divisors (see below), whose sum is σ = 33324480. Its totient is φ = 10463040.

The previous prime is 18822319. The next prime is 18822337. The reversal of 18822321 is 12322881.

It is not a de Polignac number, because 18822321 - 2¹ = 18822319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18822361) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 54070 + ... + 54416.

It is an arithmetic number, because the mean of its divisors is an integer number (694260).

Almost surely, 2^18822321 is an apocalyptic number.

It is an amenable number.

18822321 is a deficient number, since it is larger than the sum of its proper divisors (14502159).

18822321 is a wasteful number, since it uses less digits than its factorization.

18822321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 398 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 18822321 is about 4338.4698915632. The cubic root of 18822321 is about 266.0057708813.

The spelling of 18822321 in words is "eighteen million, eight hundred twenty-two thousand, three hundred twenty-one".