18012647 has 2 divisors, whose sum is σ = 18012648. Its totient is φ = 18012646.

The previous prime is 18012613. The next prime is 18012649. The reversal of 18012647 is 74621081.

It is a strong prime.

It is an emirp because it is prime and its reverse (74621081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18012647 - 2⁶ = 18012583 is a prime.

Together with 18012649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18012649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006323 + 9006324.

It is an arithmetic number, because the mean of its divisors is an integer number (9006324).

Almost surely, 2^18012647 is an apocalyptic number.

18012647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012647 is an equidigital number, since it uses as much as digits as its factorization.

18012647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18012647 is about 4244.1308886508. The cubic root of 18012647 is about 262.1355037855.

The spelling of 18012647 in words is "eighteen million, twelve thousand, six hundred forty-seven".