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.
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It is: CDXXXVII
437 is already in Hindu-Arabic numerals
Simplest is of course subjective, but I'd say 437/1 is quite simple.
0.437
4.37 = 437/100