844086138 has 24 divisors (see below), whose sum is σ = 1929770208. Its totient is φ = 241113672.

The previous prime is 844086137. The next prime is 844086163. The reversal of 844086138 is 831680448.

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 844086138.

It is not an unprimeable number, because it can be changed into a prime (844086137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186045 + ... + 190527.

It is an arithmetic number, because the mean of its divisors is an integer number (80407092).

Almost surely, 2^844086138 is an apocalyptic number.

844086138 is an abundant number, since it is smaller than the sum of its proper divisors (1085684070).

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

844086138 is an frugal number, since it uses more digits than its factorization.

844086138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8978 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 844086138 is about 29053.1605509624. The cubic root of 844086138 is about 945.0662544181.

Multiplying 844086138 by its sum of digits (42), we get a square (35451617796 = 188286²).

844086138 divided by its sum of digits (42) gives a square (20097289 = 4483²).

The spelling of 844086138 in words is "eight hundred forty-four million, eighty-six thousand, one hundred thirty-eight".