All of the digits in 23139 are significant. If you are not specifying a certain number of sig figs, then the answer is 23139.
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23100
23100
0.000709999 rounded to 3 significant figures is 0.000710
That depends on how many significant figures you are talking about.If three significant figures then 700 is the largest that rounds to 700.If four significant figures are to be rounded to three significant figures then 700.4If five significant figures are to be rounded to three significant figures then 700.49If six significant figures are to be rounded to three significant figures then 700.499etc.
0.00076321cg rounded to three significant figures is 0.000763cg