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Format the given number to nearest 10ⁿ (rounded to thousands), immediately suffixed (without space) with metric unit (k, M, G, T, P or E), rounding half up with a precision of 3 digits, whereafter trailing zeroes in fraction part are stripped. Numbers lower than thousand are not affected. For example (with English locale):

• 999.999 will appear as 999.999
• 1000 will appear as 1k
• 1004 will appear as 1k
• 1005 will appear as 1.01k
• 1594 will appear as 1.59k
• 1595 will appear as 1.6k
• 9000 will appear as 9k
• 9900 will appear as 9.9k
• 9994 will appear as 9.99k
• 9995 will appear as 10k
• 99990 will appear as 100k
• 9994999 will appear as 9.99M
• 9995000 will appear as 10M

The format locale will be set to the one as obtained by Faces#getLocale(). If the value is null, NaN or infinity, then this will return null.