6389639 has 4 divisors (see below), whose sum is σ = 6395424. Its totient is φ = 6383856.

The previous prime is 6389629. The next prime is 6389683. The reversal of 6389639 is 9369836.

6389639 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6389639 - 2⁴ = 6389623 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 6389639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6389629) 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, 662 + ... + 3635.

It is an arithmetic number, because the mean of its divisors is an integer number (1598856).

Almost surely, 2^6389639 is an apocalyptic number.

6389639 is a deficient number, since it is larger than the sum of its proper divisors (5785).

6389639 is a wasteful number, since it uses less digits than its factorization.

6389639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784.

The product of its digits is 209952, while the sum is 44.

The square root of 6389639 is about 2527.7735262480. The cubic root of 6389639 is about 185.5633086005.

The spelling of 6389639 in words is "six million, three hundred eighty-nine thousand, six hundred thirty-nine".