18045647 has 2 divisors, whose sum is σ = 18045648. Its totient is φ = 18045646.

The previous prime is 18045637. The next prime is 18045659. The reversal of 18045647 is 74654081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18045647 - 2⁴ = 18045631 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18045607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9022823 + 9022824.

It is an arithmetic number, because the mean of its divisors is an integer number (9022824).

Almost surely, 2^18045647 is an apocalyptic number.

18045647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18045647 is an equidigital number, since it uses as much as digits as its factorization.

18045647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 18045647 is about 4248.0168314167. The cubic root of 18045647 is about 262.2954875700.

The spelling of 18045647 in words is "eighteen million, forty-five thousand, six hundred forty-seven".