18585223 has 4 divisors (see below), whose sum is σ = 18749808. Its totient is φ = 18420640.

The previous prime is 18585209. The next prime is 18585227. The reversal of 18585223 is 32258581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32258581 = 23 ⋅1402547.

It is a cyclic number.

It is not a de Polignac number, because 18585223 - 2⁵ = 18585191 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 (18585227) 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 3 ways as a sum of consecutive naturals, for example, 82123 + ... + 82348.

It is an arithmetic number, because the mean of its divisors is an integer number (4687452).

Almost surely, 2^18585223 is an apocalyptic number.

18585223 is a deficient number, since it is larger than the sum of its proper divisors (164585).

18585223 is a wasteful number, since it uses less digits than its factorization.

18585223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164584.

The product of its digits is 19200, while the sum is 34.

The square root of 18585223 is about 4311.0582227569. The cubic root of 18585223 is about 264.8841216398.

The spelling of 18585223 in words is "eighteen million, five hundred eighty-five thousand, two hundred twenty-three".