Copenhagen[a] (Danish: København [kʰøpm̩ˈhaʊ̯ˀn] (About this soundlisten)) is the capital and most populous city of Denmark. As of July 2018, the city has a population of 777,218 (616,098 in Copenhagen Municipality, 103,914 in Frederiksberg Municipality, 43,005 in Tårnby Municipality, and 14,201 in Dragør Municipality).[3][7][8] It forms the core of the wider urban area of Copenhagen (population 1,627,705) and the Copenhagen metropolitan area (population 2,057,737).
It's a fair bit bigger than 600k whichever way you look at it. Frederiksberg is entirely encircled by Copenhagen municipality, there's no difference in terms of cycling. There's easily 1M people who could cycle to work/school if they wanted. As a kid I could cycle, maybe 85% in bike lanes, all the way to the end of "the Copenhagen metropolitan area" from the centre.
My main gripe with the place is they seem to hate cars. I mean the trains, underground, bus, and bike lanes work for a lot of people, but not everyone. Say I want to bring my kids and my elderly parents somewhere. Realistically the only way to do that is to drive, but they're squeezing parking spaces massively.