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The conversion from international units (IU) to milligrams (mg) depends on the substance in question, as different compounds have different conversion factors. For example, for Vitamin D, 4000 IU is equivalent to about 100 mcg, or 0.1 mg. However, for other substances, the conversion can vary significantly. To get an accurate conversion, it's essential to know the specific substance involved.
In the international standard measurement units it is 1,336,299,240 seconds
4000 = 4,000
The much of 4000 yards is:3.6576
1 billion.