9821844 has 48 divisors (see below), whose sum is σ = 25648000. Its totient is φ = 3250368.

The previous prime is 9821843. The next prime is 9821849. The reversal of 9821844 is 4481289.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 9821799 and 9821808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9821843) 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, 21264 + ... + 21720.

Almost surely, 2^9821844 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 9821844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12824000).

9821844 is an abundant number, since it is smaller than the sum of its proper divisors (15826156).

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

9821844 is a wasteful number, since it uses less digits than its factorization.

9821844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 661 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 9821844 is about 3133.9821314105. The cubic root of 9821844 is about 214.1563768080.

The spelling of 9821844 in words is "nine million, eight hundred twenty-one thousand, eight hundred forty-four".