How many people did Moses lead into the promised land?

The mature men were about 600,000 (Exodus 12:37), plus the 23,000 Levites (Numbers 3:39). To this must be added the converts (Exodus 12:38), and the women and children. Based on the ratio of firstborn to younger children (Numbers ch.3), it can be seen that the children were numerous. Estimates for the total number are usually given at two million or more.

However, it was Joshua who actually entered the promised land, not Moses (Deuteronomy ch.34- Joshua ch.1).