18638063 has 2 divisors, whose sum is σ = 18638064. Its totient is φ = 18638062.

The previous prime is 18638029. The next prime is 18638071. The reversal of 18638063 is 36083681.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18638063 - 2⁶ = 18637999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18638003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9319031 + 9319032.

It is an arithmetic number, because the mean of its divisors is an integer number (9319032).

Almost surely, 2^18638063 is an apocalyptic number.

18638063 is a deficient number, since it is larger than the sum of its proper divisors (1).

18638063 is an equidigital number, since it uses as much as digits as its factorization.

18638063 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 18638063 is about 4317.1822986758. The cubic root of 18638063 is about 265.1349164666.

The spelling of 18638063 in words is "eighteen million, six hundred thirty-eight thousand, sixty-three".