The nose pitch up tendency of a "raw" swept wing aircraft has to be engineered out so that it recovers from the stall.
The 747 will pitch nose down due to the points mentioned already:
Washout
Stick Shaker
Stick Pusher
Additional features are also the:
Camber shape of the wing
Leading Edge flap devices
This pic shows really well the washout on a 747 (angle off attack much lower at the wing tips than root).
The 747 is fitted with Kruger leading edge flaps on the INBOARD section as opposed to slotted flaps on the leading outboard section. Kruger flaps are basically a section of wing that folds forward from underneath the leading edge. Slotted flaps are far more efficient WRT keeping the boundary layer attached on the outboard sections.
The big Kruger "scoops" also create more upwash and induced AoA which brings on the stall earlier.
This pic shows the inboard Krugers and slotted outboards.
