6421344 has 24 divisors (see below), whose sum is σ = 16856280. Its totient is φ = 2140416.

The previous prime is 6421343. The next prime is 6421351. The reversal of 6421344 is 4431246.

6421344 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33349 + ... + 33540.

It is an arithmetic number, because the mean of its divisors is an integer number (702345).

Almost surely, 2^6421344 is an apocalyptic number.

It is an amenable number.

6421344 is an abundant number, since it is smaller than the sum of its proper divisors (10434936).

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

6421344 is a wasteful number, since it uses less digits than its factorization.

6421344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66902 (or 66894 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 6421344 is about 2534.0370952297. The cubic root of 6421344 is about 185.8697203086.

The spelling of 6421344 in words is "six million, four hundred twenty-one thousand, three hundred forty-four".