6438840 has 32 divisors (see below), whose sum is σ = 19316880. Its totient is φ = 1716992.

The previous prime is 6438833. The next prime is 6438871. The reversal of 6438840 is 488346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26709 + ... + 26948.

Almost surely, 2^6438840 is an apocalyptic number.

6438840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6438840 is an abundant number, since it is smaller than the sum of its proper divisors (12878040).

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

6438840 is a wasteful number, since it uses less digits than its factorization.

6438840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53671 (or 53667 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 6438840 is about 2537.4869457792. The cubic root of 6438840 is about 186.0383780214.

The spelling of 6438840 in words is "six million, four hundred thirty-eight thousand, eight hundred forty".