18805243 has 2 divisors, whose sum is σ = 18805244. Its totient is φ = 18805242.

The previous prime is 18805229. The next prime is 18805261. The reversal of 18805243 is 34250881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18805243 - 2⁵ = 18805211 is a prime.

It is not a weakly prime, because it can be changed into another prime (18805223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9402621 + 9402622.

It is an arithmetic number, because the mean of its divisors is an integer number (9402622).

Almost surely, 2^18805243 is an apocalyptic number.

18805243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18805243 is an equidigital number, since it uses as much as digits as its factorization.

18805243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 18805243 is about 4336.5012394787. The cubic root of 18805243 is about 265.9252951313.

The spelling of 18805243 in words is "eighteen million, eight hundred five thousand, two hundred forty-three".