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One millionth is equal to 0.000 001, or 1 x 10−6 in scientific notation. It is the reciprocal of a million, can be also written as 1/1 000 000. Units using this fraction can be indicated using the prefix "micro-" from Greek, meaning "small". Numbers of this quantity are expressed in terms of µ (the Greek letter mu).
It is also the ordinal that comes after the nine hundred, ninety-nine thousand, nine hundred, ninety-ninth and before the million and first.
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