18436223 has 8 divisors (see below), whose sum is σ = 20127408. Its totient is φ = 16784064.

The previous prime is 18436193. The next prime is 18436241. The reversal of 18436223 is 32263481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18436223 - 2¹⁴ = 18419839 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 (18436123) 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 7 ways as a sum of consecutive naturals, for example, 8765 + ... + 10662.

It is an arithmetic number, because the mean of its divisors is an integer number (2515926).

Almost surely, 2^18436223 is an apocalyptic number.

18436223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18436223 is a deficient number, since it is larger than the sum of its proper divisors (1691185).

18436223 is a wasteful number, since it uses less digits than its factorization.

18436223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19513.

The product of its digits is 6912, while the sum is 29.

The square root of 18436223 is about 4293.7423071256. The cubic root of 18436223 is about 264.1743520383.

The spelling of 18436223 in words is "eighteen million, four hundred thirty-six thousand, two hundred twenty-three".