You've already done it! You have all the digits. Just take the words away.
Or, if you want to get fancy, put commas in place of the words: 4,437,517
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437 billion is written 437,000,000,000. 3 billion is written 3,000,000,000. To write it as one number, add them together. The answer is 440,000,000,000. If you want to write 437 billion 3 million, it is 437,003,000,000.
It is: CDXXXVII
437 is already in Hindu-Arabic numerals
441
None - its a prime number and can only be times by itself and one.