2021844 has 72 divisors (see below), whose sum is σ = 5570208. Its totient is φ = 565760.

The previous prime is 2021843. The next prime is 2021849. The reversal of 2021844 is 4481202.

It is a self number, because there is not a number n which added to its sum of digits gives 2021844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021843) 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 23 ways as a sum of consecutive naturals, for example, 38122 + ... + 38174.

It is an arithmetic number, because the mean of its divisors is an integer number (77364).

2^2021844 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 2021844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2785104).

2021844 is an abundant number, since it is smaller than the sum of its proper divisors (3548364).

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

2021844 is a wasteful number, since it uses less digits than its factorization.

2021844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 2021844 is about 1421.9156093102. The cubic root of 2021844 is about 126.4491403496.

The spelling of 2021844 in words is "two million, twenty-one thousand, eight hundred forty-four".