840008844040 has 32 divisors (see below), whose sum is σ = 1900462014360. Its totient is φ = 334147161600.

The previous prime is 840008843987. The next prime is 840008844041. The reversal of 840008844040 is 40448800048.

It can be written as a sum of positive squares in 4 ways, for example, as 531910579684 + 308098264356 = 729322^2 + 555066^2 .

It is a super-2 number, since 2×840008844040² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 840008843984 and 840008844002.

It is not an unprimeable number, because it can be changed into a prime (840008844041) by changing a digit.

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, 58004421 + ... + 58018900.

Almost surely, 2^840008844040 is an apocalyptic number.

It is an amenable number.

840008844040 is an abundant number, since it is smaller than the sum of its proper divisors (1060453170320).

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

840008844040 is a wasteful number, since it uses less digits than its factorization.

840008844040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116023513 (or 116023509 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 40.

The spelling of 840008844040 in words is "eight hundred forty billion, eight million, eight hundred forty-four thousand, forty".