844921 has 8 divisors (see below), whose sum is σ = 1053504. Its totient is φ = 658320.

The previous prime is 844913. The next prime is 844927. The reversal of 844921 is 129448.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 844921 - 2³ = 844913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 844921.

It is not an unprimeable number, because it can be changed into a prime (844927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5410 + ... + 5563.

It is an arithmetic number, because the mean of its divisors is an integer number (131688).

2⁸⁴⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

844921 is a deficient number, since it is larger than the sum of its proper divisors (208583).

844921 is a wasteful number, since it uses less digits than its factorization.

844921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10991.

The product of its digits is 2304, while the sum is 28.

The square root of 844921 is about 919.1958442030. The cubic root of 844921 is about 94.5377731286.

It can be divided in two parts, 84 and 4921, that added together give a palindrome (5005).

The spelling of 844921 in words is "eight hundred forty-four thousand, nine hundred twenty-one".