6439847 has 8 divisors (see below), whose sum is σ = 6679680. Its totient is φ = 6202080.

The previous prime is 6439837. The next prime is 6439903. The reversal of 6439847 is 7489346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6439847 - 2²² = 2245543 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 (6439837) 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 7 ways as a sum of consecutive naturals, for example, 8729 + ... + 9437.

It is an arithmetic number, because the mean of its divisors is an integer number (834960).

Almost surely, 2^6439847 is an apocalyptic number.

6439847 is a deficient number, since it is larger than the sum of its proper divisors (239833).

6439847 is a wasteful number, since it uses less digits than its factorization.

6439847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033.

The product of its digits is 145152, while the sum is 41.

The square root of 6439847 is about 2537.6853626878. The cubic root of 6439847 is about 186.0480759836.

The spelling of 6439847 in words is "six million, four hundred thirty-nine thousand, eight hundred forty-seven".