18122223 has 16 divisors (see below), whose sum is σ = 27820800. Its totient is φ = 10278336.

The previous prime is 18122207. The next prime is 18122243. The reversal of 18122223 is 32222181.

It is a happy number.

It is not a de Polignac number, because 18122223 - 2⁴ = 18122207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 18122223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122243) 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 15 ways as a sum of consecutive naturals, for example, 273 + ... + 6026.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^18122223 is an apocalyptic number.

18122223 is a deficient number, since it is larger than the sum of its proper divisors (9698577).

18122223 is a wasteful number, since it uses less digits than its factorization.

18122223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6446.

The product of its digits is 384, while the sum is 21.

The square root of 18122223 is about 4257.0204368784. The cubic root of 18122223 is about 262.6659775707.

The spelling of 18122223 in words is "eighteen million, one hundred twenty-two thousand, two hundred twenty-three".