18874243 has 2 divisors, whose sum is σ = 18874244. Its totient is φ = 18874242.

The previous prime is 18874241. The next prime is 18874249. The reversal of 18874243 is 34247881.

It is a weak prime.

It is an emirp because it is prime and its reverse (34247881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18874243 - 2¹ = 18874241 is a prime.

Together with 18874241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18874241) 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, 9437121 + 9437122.

It is an arithmetic number, because the mean of its divisors is an integer number (9437122).

Almost surely, 2^18874243 is an apocalyptic number.

18874243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18874243 is an equidigital number, since it uses as much as digits as its factorization.

18874243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 18874243 is about 4344.4496774620. The cubic root of 18874243 is about 266.2501415797.

The spelling of 18874243 in words is "eighteen million, eight hundred seventy-four thousand, two hundred forty-three".