6439424 has 20 divisors (see below), whose sum is σ = 12867294. Its totient is φ = 3219456.

The previous prime is 6439397. The next prime is 6439427. The reversal of 6439424 is 4249346.

6439424 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4129024 + 2310400 = 2032^2 + 1520^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439427) 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 as a sum of consecutive naturals, namely, 5777 + ... + 6800.

Almost surely, 2^6439424 is an apocalyptic number.

6439424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6439424 is a deficient number, since it is larger than the sum of its proper divisors (6427870).

6439424 is an equidigital number, since it uses as much as digits as its factorization.

6439424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12595 (or 12579 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 6439424 is about 2537.6020176537. The cubic root of 6439424 is about 186.0440023848.

The spelling of 6439424 in words is "six million, four hundred thirty-nine thousand, four hundred twenty-four".