844240 has 40 divisors (see below), whose sum is σ = 2006568. Its totient is φ = 330240.

The previous prime is 844201. The next prime is 844243. The reversal of 844240 is 42448.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 788544 = 236^2 + 888^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4794 + ... + 4966.

2⁸⁴⁴²⁴⁰ is an apocalyptic number.

844240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 844240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003284).

844240 is an abundant number, since it is smaller than the sum of its proper divisors (1162328).

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

844240 is a wasteful number, since it uses less digits than its factorization.

844240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 844240 is about 918.8253370473. The cubic root of 844240 is about 94.5123673893.

Adding to 844240 its reverse (42448), we get a palindrome (886688).

The spelling of 844240 in words is "eight hundred forty-four thousand, two hundred forty".