6439856 has 20 divisors (see below), whose sum is σ = 12908400. Its totient is φ = 3108672.

The previous prime is 6439837. The next prime is 6439903. The reversal of 6439856 is 6589346.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6476 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (645420).

Almost surely, 2^6439856 is an apocalyptic number.

It is an amenable number.

6439856 is an abundant number, since it is smaller than the sum of its proper divisors (6468544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6439856 is a wasteful number, since it uses less digits than its factorization.

6439856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13916 (or 13910 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 6439856 is about 2537.6871359567. The cubic root of 6439856 is about 186.0481626540.

The spelling of 6439856 in words is "six million, four hundred thirty-nine thousand, eight hundred fifty-six".