844440 has 64 divisors (see below), whose sum is σ = 2626560. Its totient is φ = 216960.

The previous prime is 844439. The next prime is 844447. The reversal of 844440 is 44448.

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

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 844440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3607 + ... + 3833.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁸⁴⁴⁴⁴⁰ 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 844440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313280).

844440 is an abundant number, since it is smaller than the sum of its proper divisors (1782120).

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

844440 is a wasteful number, since it uses less digits than its factorization.

844440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 844440 is about 918.9341652153. The cubic root of 844440 is about 94.5198301097.

Adding to 844440 its reverse (44448), we get a palindrome (888888).

The spelling of 844440 in words is "eight hundred forty-four thousand, four hundred forty".