6394639 has 4 divisors (see below), whose sum is σ = 6407856. Its totient is φ = 6381424.

The previous prime is 6394637. The next prime is 6394643. The reversal of 6394639 is 9364936.

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 6394639 - 2¹ = 6394637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6394637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5854 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1601964).

Almost surely, 2^6394639 is an apocalyptic number.

6394639 is a deficient number, since it is larger than the sum of its proper divisors (13217).

6394639 is a wasteful number, since it uses less digits than its factorization.

6394639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13216.

The product of its digits is 104976, while the sum is 40.

The square root of 6394639 is about 2528.7623454963. The cubic root of 6394639 is about 185.6116981176.

The spelling of 6394639 in words is "six million, three hundred ninety-four thousand, six hundred thirty-nine".