18385243 has 2 divisors, whose sum is σ = 18385244. Its totient is φ = 18385242.

The previous prime is 18385207. The next prime is 18385249. The reversal of 18385243 is 34258381.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34258381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18385243 - 2⁹ = 18384731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18385199 and 18385208.

It is not a weakly prime, because it can be changed into another prime (18385249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192621 + 9192622.

It is an arithmetic number, because the mean of its divisors is an integer number (9192622).

Almost surely, 2^18385243 is an apocalyptic number.

18385243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385243 is an equidigital number, since it uses as much as digits as its factorization.

18385243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The square root of 18385243 is about 4287.8016511961. The cubic root of 18385243 is about 263.9306281990.

The spelling of 18385243 in words is "eighteen million, three hundred eighty-five thousand, two hundred forty-three".