18385823 has 8 divisors (see below), whose sum is σ = 19504800. Its totient is φ = 17271040.

The previous prime is 18385819. The next prime is 18385837. The reversal of 18385823 is 32858381.

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 18385823 - 2² = 18385819 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 (18384823) 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, 17003 + ... + 18051.

It is an arithmetic number, because the mean of its divisors is an integer number (2438100).

Almost surely, 2^18385823 is an apocalyptic number.

18385823 is a deficient number, since it is larger than the sum of its proper divisors (1118977).

18385823 is a wasteful number, since it uses less digits than its factorization.

18385823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097.

The product of its digits is 46080, while the sum is 38.

The square root of 18385823 is about 4287.8692843882. The cubic root of 18385823 is about 263.9334035799.

The spelling of 18385823 in words is "eighteen million, three hundred eighty-five thousand, eight hundred twenty-three".