None.
Half an inch is a measure of distance in 1-dimensional space. A thousand is a pure number. According to the basic rules of dimensional analysis, conversion from one to the other is not valid.
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If you mean thousandths then there are 1000 of them in an inch.
There are eight eighths in one inch. Therefore, in half an inch, there would be four eighths.
Eight half inch cubes would fill a one inch cube.
1/2 inch = 1.27cm
a million is 1000 thousands so half a million is 500 thousands.