18001223 has 4 divisors (see below), whose sum is σ = 18034680. Its totient is φ = 17967768.

The previous prime is 18001213. The next prime is 18001237. The reversal of 18001223 is 32210081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18001223 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 (18001213) 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, 15908 + ... + 17001.

It is an arithmetic number, because the mean of its divisors is an integer number (4508670).

Almost surely, 2^18001223 is an apocalyptic number.

18001223 is a deficient number, since it is larger than the sum of its proper divisors (33457).

18001223 is an equidigital number, since it uses as much as digits as its factorization.

18001223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33456.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 18001223 is about 4242.7848166034. The cubic root of 18001223 is about 262.0800747804.

The spelling of 18001223 in words is "eighteen million, one thousand, two hundred twenty-three".