The 4049 contains 6 Inverter gates.
Minimum supply voltage 3v
Maximum supply voltage 15v
Max current per output 10mA
Maximum speed of operation 4MHz
Current consumption approx 1uA with nothing connected to the inputs or outputs.

See also 4069UB
The 4069UB has better placement of the inverters and takes less current.  It is also a 14 pin chip.