Scientific notation would have you display this as: 1.23e5Scientific notation would have you display this as: 1.23e5, it's more 'correct' when it comes to units: 1.23e5 m is right, whereas 123k m isn't (it should be 123 km).
However if your users aren't comfortable with the 'k' postfix then I doubt they'd like this much, I merely mention it for completeness.
Other possibilities might be to have something like: 123thou or 123,000123thou or 123,000
