6421884 has 48 divisors (see below), whose sum is σ = 17337600. Its totient is φ = 1812096.

The previous prime is 6421873. The next prime is 6421901. The reversal of 6421884 is 4881246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7047 + ... + 7905.

It is an arithmetic number, because the mean of its divisors is an integer number (361200).

Almost surely, 2^6421884 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 6421884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8668800).

6421884 is an abundant number, since it is smaller than the sum of its proper divisors (10915716).

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

6421884 is a wasteful number, since it uses less digits than its factorization.

6421884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962 (or 960 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 6421884 is about 2534.1436423376. The cubic root of 6421884 is about 185.8749303724.

The spelling of 6421884 in words is "six million, four hundred twenty-one thousand, eight hundred eighty-four".