6421844 has 48 divisors (see below), whose sum is σ = 13453440. Its totient is φ = 2643840.

The previous prime is 6421843. The next prime is 6421873. The reversal of 6421844 is 4481246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421841) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 58862 + ... + 58970.

It is an arithmetic number, because the mean of its divisors is an integer number (280280).

Almost surely, 2^6421844 is an apocalyptic number.

It is an amenable number.

6421844 is an abundant number, since it is smaller than the sum of its proper divisors (7031596).

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

6421844 is a wasteful number, since it uses less digits than its factorization.

6421844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 238 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 6421844 is about 2534.1357501128. The cubic root of 6421844 is about 185.8745444518.

The spelling of 6421844 in words is "six million, four hundred twenty-one thousand, eight hundred forty-four".