There's no such thing.
It doesn't make sense to talk about "the greatest real number smaller than a certain value", since it's undefined, and that's basically what you're asking for. 1,000,000.5 rounds to 1,000,001 (usually; in some instances it might be your answer, since in some fields the rounding rules say that .5 rounds to the even number).
However, using the usual rounding rules of "0.5 and higher round up, anything less rounds down," you can't specify a particular value.
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100.49999999999999999999999999...
To the nearest million, 7,362,000 rounds to 7,000,000 .
749 rounded to the nearest hundred is 700
The answer depends on the extent of rounding. It could be 1349 to the nearest 900.
The answers depend on the extent of rounding. To the nearest 5000, they are 2501 and 7499.