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It is necessary to download the document.
Downloading document is necessary.
The document is necessary to download.

I think 1, 2 are correct, but not sure about 3. Is #3 correct and does it carry the same meaning?
Thanks.
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LiveinjapanIn respect to #3, how about this?

This book is good to read.

I know this structure looks similar to #3 but slightly different in semantics.

The adjective itself (necessary, good, etc.) is what determines whether an infinitive can follow. Some adjectives allow the infinitive; others do not. good does; necessary does not.

That's good to know.
That's hard to do.

*That's necessary to know.
It's necessary to know that.
*That is unproductive to do.
It is unproductive to do that.
*That is effective to do.
It is effective to do that.

CJ
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Comments  
You need the article in the second one for formal writing.
The third one is nonsense.

Rgdz, - A.
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Oops, I missed the for #2.

Thanks, Avangi!
In respect to #3, how about this?

This book is good to read.

I know this structure looks similar to #3 but slightly different in semantics.
That doesn't sound good to me.

I'd say

This is a good book to read. or

This book makes for a good/fine read.
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Liveinjapan This book is good to read.
The structure is quite natural to me. Perhaps it's a regional issue with others.

I remember when I was much younger, someone said, "You're nice to kiss." Why would I remember that? Anyway, it sounded good at the time.

This car is fun to drive!
 CalifJim's reply was promoted to an answer.
Thank you all!
It's a great thread!
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I think the difference between "This book is good to read" and "This is a good book to read" is that with the first, you're expressing your enjoyment, while with the second, you could be recommending it to someone else.
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