Weight and length are not directly comparable. I have a feeling you meant milligrams. If so, there are 1,000,000 nanograms in a milligram.
1,000,000,000,000 nanograms are in one kilogram.
There are 453,592,370,000 nanograms in one pound
1,000,000,000 (one billion) nanograms are inside of one gram.
One million
There are 1000000 nanograms in one milligram. Therefore, 5.2 milligrams is equal to 5.2 x 1000000 = 5200000 nanograms.
A million nanograms.
There are 1000000 nanograms in a milligram. Therefore 2533 nanograms is 0.002533 milligrams.
There are 1000000 nanograms in a milligram. Therefore 1000 nanograms is 0.001 milligrams.
There are 1000000 nanograms in a milligram. Therefore 25 milligrams will be 25,000,000 nanograms.
There are 1000000 nanograms in a milligram. Therefore 4 nanograms is 0.000004 milligrams.
There are 1000 nanograms in a microgram. You have to multiply micro by 1000 to convert to nanograms. 10*1000 is 10,000 nanograms.
One millimeter is 0.000001km