18450647 has 2 divisors, whose sum is σ = 18450648. Its totient is φ = 18450646.

The previous prime is 18450637. The next prime is 18450667. The reversal of 18450647 is 74605481.

It is a weak prime.

It is an emirp because it is prime and its reverse (74605481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18450647 - 2⁴ = 18450631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18450637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9225323 + 9225324.

It is an arithmetic number, because the mean of its divisors is an integer number (9225324).

Almost surely, 2^18450647 is an apocalyptic number.

18450647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18450647 is an equidigital number, since it uses as much as digits as its factorization.

18450647 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 18450647 is about 4295.4216323895. The cubic root of 18450647 is about 264.2432283577.

The spelling of 18450647 in words is "eighteen million, four hundred fifty thousand, six hundred forty-seven".