18783223 has 4 divisors (see below), whose sum is σ = 18813168. Its totient is φ = 18753280.

The previous prime is 18783211. The next prime is 18783251. The reversal of 18783223 is 32238781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32238781 = 2029 ⋅15889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18783223 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 (18783293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14011 + ... + 15292.

It is an arithmetic number, because the mean of its divisors is an integer number (4703292).

Almost surely, 2^18783223 is an apocalyptic number.

18783223 is a deficient number, since it is larger than the sum of its proper divisors (29945).

18783223 is an equidigital number, since it uses as much as digits as its factorization.

18783223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29944.

The product of its digits is 16128, while the sum is 34.

The square root of 18783223 is about 4333.9615826631. The cubic root of 18783223 is about 265.8214595138.

The spelling of 18783223 in words is "eighteen million, seven hundred eighty-three thousand, two hundred twenty-three".