6389663 has 4 divisors (see below), whose sum is σ = 7302480. Its totient is φ = 5476848.

The previous prime is 6389629. The next prime is 6389683. The reversal of 6389663 is 3669836.

6389663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6389663 - 2⁸ = 6389407 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6389663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6389623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456398 + ... + 456411.

It is an arithmetic number, because the mean of its divisors is an integer number (1825620).

Almost surely, 2^6389663 is an apocalyptic number.

6389663 is a deficient number, since it is larger than the sum of its proper divisors (912817).

6389663 is an equidigital number, since it uses as much as digits as its factorization.

6389663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912816.

The product of its digits is 139968, while the sum is 41.

The square root of 6389663 is about 2527.7782735042. The cubic root of 6389663 is about 185.5635409304.

It can be divided in two parts, 638 and 9663, that added together give a palindrome (10301).

The spelling of 6389663 in words is "six million, three hundred eighty-nine thousand, six hundred sixty-three".