844440040 has 32 divisors (see below), whose sum is σ = 1906874280. Its totient is φ = 336552192.

The previous prime is 844440013. The next prime is 844440049. The reversal of 844440040 is 40044448.

It can be written as a sum of positive squares in 4 ways, for example, as 598389444 + 246050596 = 24462^2 + 15686^2 .

It is a junction number, because it is equal to n+sod(n) for n = 844439990 and 844440008.

It is not an unprimeable number, because it can be changed into a prime (844440049) 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 7 ways as a sum of consecutive naturals, for example, 27027 + ... + 49186.

Almost surely, 2^844440040 is an apocalyptic number.

It is an amenable number.

844440040 is an abundant number, since it is smaller than the sum of its proper divisors (1062434240).

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

844440040 is a wasteful number, since it uses less digits than its factorization.

844440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76501 (or 76497 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

The square root of 844440040 is about 29059.2505065083. The cubic root of 844440040 is about 945.1983160209.

Adding to 844440040 its reverse (40044448), we get a palindrome (884484488).

It can be divided in two parts, 8444 and 40040, that added together give a palindrome (48484).

The spelling of 844440040 in words is "eight hundred forty-four million, four hundred forty thousand, forty".