18038663 has 2 divisors, whose sum is σ = 18038664. Its totient is φ = 18038662.

The previous prime is 18038659. The next prime is 18038677. The reversal of 18038663 is 36683081.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (36683081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18038663 - 2² = 18038659 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18038263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019331 + 9019332.

It is an arithmetic number, because the mean of its divisors is an integer number (9019332).

Almost surely, 2^18038663 is an apocalyptic number.

18038663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18038663 is an equidigital number, since it uses as much as digits as its factorization.

18038663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 18038663 is about 4247.1947212248. The cubic root of 18038663 is about 262.2616454646.

The spelling of 18038663 in words is "eighteen million, thirty-eight thousand, six hundred sixty-three".