18322223 has 4 divisors (see below), whose sum is σ = 18335160. Its totient is φ = 18309288.

The previous prime is 18322219. The next prime is 18322231. The reversal of 18322223 is 32222381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32222381 = 1223 ⋅26347.

It is a cyclic number.

It is not a de Polignac number, because 18322223 - 2² = 18322219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18322253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4040 + ... + 7277.

It is an arithmetic number, because the mean of its divisors is an integer number (4583790).

Almost surely, 2^18322223 is an apocalyptic number.

18322223 is a deficient number, since it is larger than the sum of its proper divisors (12937).

18322223 is a wasteful number, since it uses less digits than its factorization.

18322223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936.

The product of its digits is 1152, while the sum is 23.

The square root of 18322223 is about 4280.4465888503. The cubic root of 18322223 is about 263.6287203239.

The spelling of 18322223 in words is "eighteen million, three hundred twenty-two thousand, two hundred twenty-three".