What two numbers add up to 6405?

There are infinite combinations of two numbers that add up to 6405. Here are some examples using negative numbers:

-1 + 6406 = 6405
-2 + 6407 = 6405
-3 + 6408 = 6405
...

Here are some examples using two fractions that will add up to 6405:

6405/2 + 6405/2 = 6405
12810/3 + 6405/3 = 6405
19215/4 + 6405/4 = 6405
...

And here are some examples using two decimal numbers that will add up to 6405:

1.25 + 6403.75 = 6405
2.50 + 6402.5 = 6405
3.75 + 6401.25 = 6405
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6405?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 6405. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 6405?" has 3202 answers:

1 + 6404 = 6405
2 + 6403 = 6405
3 + 6402 = 6405
.
.
3200 + 3205 = 6405
3201 + 3204 = 6405
3202 + 3203 = 6405

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 6405 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 6406?
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