18005147 has 2 divisors, whose sum is σ = 18005148. Its totient is φ = 18005146.

The previous prime is 18005129. The next prime is 18005161. The reversal of 18005147 is 74150081.

It is a strong prime.

It is an emirp because it is prime and its reverse (74150081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18005147 - 2¹⁶ = 17939611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18005177) 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, 9002573 + 9002574.

It is an arithmetic number, because the mean of its divisors is an integer number (9002574).

Almost surely, 2^18005147 is an apocalyptic number.

18005147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18005147 is an equidigital number, since it uses as much as digits as its factorization.

18005147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 18005147 is about 4243.2472235306. The cubic root of 18005147 is about 262.0991165884.

The spelling of 18005147 in words is "eighteen million, five thousand, one hundred forty-seven".