Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Danish name | English name | Seat of administration | Largest city | Population (January 1, 2008) | Area (km²) | Pop. density (per km²) |
| --- | --- | --- | --- | --- | --- | --- |
| Region Hovedstaden | Capital Region of Denmark | Hillerød | Copenhagen | 1645825.0 | 2561.0 | 642.6 |
| Region Midtjylland | Central Denmark Region | Viborg | Århus | 1237041.0 | 13142.0 | 94.2 |
| Region Nordjylland | North Denmark Region | Aalborg | Aalborg | 578839.0 | 7927.0 | 73.2 |
| Region Sjælland | Region Zealand | Sorø | Roskilde | 819427.0 | 7273.0 | 112.7 |
| Region Syddanmark | Region of Southern Denmark | Vejle | Odense | 1194659.0 | 12191.0 | 97.99 |
Question:
What is the minimum population of the region in which Roskilde is the largest city?
Answer:
819427.0