844239228 has 72 divisors (see below), whose sum is σ = 2295482112. Its totient is φ = 240793056.

The previous prime is 844239223. The next prime is 844239229. The reversal of 844239228 is 822932448.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 844239228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844239223) 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, 532525 + ... + 534107.

It is an arithmetic number, because the mean of its divisors is an integer number (31881696).

Almost surely, 2^844239228 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 844239228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1147741056).

844239228 is an abundant number, since it is smaller than the sum of its proper divisors (1451242884).

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

844239228 is a wasteful number, since it uses less digits than its factorization.

844239228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511 (or 2502 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 844239228 is about 29055.7950846298. The cubic root of 844239228 is about 945.1233858096.

The spelling of 844239228 in words is "eight hundred forty-four million, two hundred thirty-nine thousand, two hundred twenty-eight".