844085140 has 24 divisors (see below), whose sum is σ = 1788270120. Its totient is φ = 334645248.

The previous prime is 844085129. The next prime is 844085159. The reversal of 844085140 is 41580448.

It can be written as a sum of positive squares in 4 ways, for example, as 95296644 + 748788496 = 9762^2 + 27364^2 .

It is a junction number, because it is equal to n+sod(n) for n = 844085096 and 844085105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184485 + ... + 189004.

It is an arithmetic number, because the mean of its divisors is an integer number (74511255).

Almost surely, 2^844085140 is an apocalyptic number.

It is an amenable number.

844085140 is an abundant number, since it is smaller than the sum of its proper divisors (944184980).

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

844085140 is a wasteful number, since it uses less digits than its factorization.

844085140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373611 (or 373609 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 844085140 is about 29053.1433755454. The cubic root of 844085140 is about 945.0658819535.

The spelling of 844085140 in words is "eight hundred forty-four million, eighty-five thousand, one hundred forty".