What was the world population in 1445 BC and what was it in 2,900 BC?

Question

We know that in about 1445 BC 600,000 Israeli adult people exited Egypt. They must have been between 5 and 20 percent of the population (or between 8 and 17 percent speculatively speaking); we know this because they were considered to be important socio-economically to Egypt. The population of the world was probably 8 to 13 times that or thereabouts. Also see Genesis chapter 11 which takes us from about 4990 BC to about 2900 BC near the end of Peleg's era, and to nearly 2,000 BC.

Also 2,700 was probably about the height of the pyramid age, what was the population of Egypt. Formula for population growth (though you don't need it to answer the main questions) is Population = initial population time the series product of (1 + rate of growth) to the power time: P = A( 1 + r)^t
show your reasoning.

Answer 1

1 billion was reached in 1802.
2 billion was reached 125 years later in 1927.
3 billion was reached 34 years later in 1961.
4 billion was reached 13 years later in 1974.
5 billion was reached 13 years later in 1987.
6 billion was reached 12 years later in 1999.
From the figures above, the world's population has tripled in 72 years, and doubled in 38 years up to the year of 1999.

Including a few more estimates (beginning with 250 million around AD 950 and ending with 8 billion in 2027), the world population was doubled by the following years (doubling times in parentheses):

AD 950 (650) 1600 (202) 1802 (125) 1927 (47) 1974 (50) 2027,
or (beginning with 375 million around year 1420):

1420 (300) 1720 (155) 1875 (86) 1961 (38) 1999.

Answer 2

Need to make a research.

Answer 3

Not completely sure about this one