18223443 has 54 divisors (see below), whose sum is σ = 32375772. Its totient is φ = 9843120.

The previous prime is 18223441. The next prime is 18223459. The reversal of 18223443 is 34432281.

It is not a de Polignac number, because 18223443 - 2¹ = 18223441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18223441) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 423780 + ... + 423822.

Almost surely, 2^18223443 is an apocalyptic number.

18223443 is a deficient number, since it is larger than the sum of its proper divisors (14152329).

18223443 is a wasteful number, since it uses less digits than its factorization.

18223443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 84 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 18223443 is about 4268.8924793206. The cubic root of 18223443 is about 263.1541020766.

The spelling of 18223443 in words is "eighteen million, two hundred twenty-three thousand, four hundred forty-three".