844040 has 16 divisors (see below), whose sum is σ = 1899180. Its totient is φ = 337600.

The previous prime is 844013. The next prime is 844043. The reversal of 844040 is 40448.

It can be written as a sum of positive squares in 2 ways, for example, as 806404 + 37636 = 898^2 + 194^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 844040.

It is not an unprimeable number, because it can be changed into a prime (844043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10511 + ... + 10590.

2⁸⁴⁴⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

844040 is an abundant number, since it is smaller than the sum of its proper divisors (1055140).

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

844040 is a wasteful number, since it uses less digits than its factorization.

844040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21112 (or 21108 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 844040 is about 918.7164959877. The cubic root of 844040 is about 94.5049034903.

Adding to 844040 its reverse (40448), we get a palindrome (884488).

The spelling of 844040 in words is "eight hundred forty-four thousand, forty".