Jacob , his sons and their families were in Egypt for 400 years.  Some scholars say 430 years, but reckoning from 400 years to the Exodus, that would put the time at 1886 BC.  The pharaoh at that time is uncertain but could have been Sobekneferu a female ruler, but more likely was Amenemhet II, so I'll go with that.  He ruled from 1897 BC to 1878 BC. Joseph was in Egypt when he was 17 years old and 30 years old he was made pharaoh' s vizier.  The seven years of plenty began and Jacobs and his brothers came to  Egypt sometime in that period of time.  Jacob died in Egypt after he had been there 17 years. 

• Genesis 47:28 And Jacob lived in the land of Egypt seventeen years, and the length of his life was 147 years. Jacob lived in Egypt seventeen years, and the years of his life were a hundred and forty-seven. Jacob lived for seventeen years after his arrival in Egypt, so he lived 147 years in all. And Jacob lived in the land of Egypt seventeen years.
• Doing the math.  1886 - 17 = 1839  Jacob died in 1839  BC.  He was 147 years old when he died.  So 1839 + 147 give us 1986 BC as the year Jacob (and Esau) were born.  He and Esau were born when Isaac was 60 years old. therefore Isaac was born 1986 + 60 in 2046 BC.  Abraham was 100 years old when Isaac was born which puts Abrahams birth at 2146 BC.   
• Abraham was 175 yrs old when he died (Genesis 25:7). Abraham was 86 years old when Ishmael was born (Genesis ch.16) and 100 years old when Isaac was born (Genesis ch.21).