6439936 has 44 divisors (see below), whose sum is σ = 13592080. Its totient is φ = 3041280.

The previous prime is 6439933. The next prime is 6439949. The reversal of 6439936 is 6399346.

It is not an unprimeable number, because it can be changed into a prime (6439933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19291 + ... + 19621.

Almost surely, 2^6439936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6439936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6796040).

6439936 is an abundant number, since it is smaller than the sum of its proper divisors (7152144).

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

6439936 is a wasteful number, since it uses less digits than its factorization.

6439936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 352 counting only the distinct ones).

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

The square root of 6439936 is about 2537.7028982921. The cubic root of 6439936 is about 186.0489330538.

It can be divided in two parts, 64 and 39936, that added together give a square (40000 = 200²).

The spelling of 6439936 in words is "six million, four hundred thirty-nine thousand, nine hundred thirty-six".