One millimetre is equal to 1000 micrometres or 1000000 nanometres. Since an inch is officially defined as exactly 25.4 millimetres, a millimetre is equal to exactly 5⁄127 (≈ 0.03937) of an inch.
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Nov 14, 2022 · MM is a standard abbreviation for million that is commonly used in accounting and finance. M is the Roman Numeral for 1000.