6389643 has 16 divisors (see below), whose sum is σ = 9658880. Its totient is φ = 3724704.

The previous prime is 6389629. The next prime is 6389683. The reversal of 6389643 is 3469836.

It is not a de Polignac number, because 6389643 - 2⁸ = 6389387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 3571 + ... + 5052.

It is an arithmetic number, because the mean of its divisors is an integer number (603680).

Almost surely, 2^6389643 is an apocalyptic number.

6389643 is a deficient number, since it is larger than the sum of its proper divisors (3269237).

6389643 is a wasteful number, since it uses less digits than its factorization.

6389643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658.

The product of its digits is 93312, while the sum is 39.

The square root of 6389643 is about 2527.7743174579. The cubic root of 6389643 is about 185.5633473222.

The spelling of 6389643 in words is "six million, three hundred eighty-nine thousand, six hundred forty-three".