18028247 has 2 divisors, whose sum is σ = 18028248. Its totient is φ = 18028246.

The previous prime is 18028237. The next prime is 18028261. The reversal of 18028247 is 74282081.

It is a weak prime.

It is an emirp because it is prime and its reverse (74282081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18028247 - 2¹⁰ = 18027223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18028237) 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 as a sum of consecutive naturals, namely, 9014123 + 9014124.

It is an arithmetic number, because the mean of its divisors is an integer number (9014124).

Almost surely, 2^18028247 is an apocalyptic number.

18028247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028247 is an equidigital number, since it uses as much as digits as its factorization.

18028247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18028247 is about 4245.9683230095. The cubic root of 18028247 is about 262.2111568141.

The spelling of 18028247 in words is "eighteen million, twenty-eight thousand, two hundred forty-seven".