In what year did Martin Van Buren first take office as President?

Which number president was Martin Van Buren? Who succeeded Martin Van Buren as President of the United States? Which political party did President Martin Van Buren belong to? Which president served from 1837 to 1841? In which state was Martin Van Buren born? Who served as Vice President under Martin Van Buren? Under which president did Richard M. Johnson serve as Vice President? Which number president was William Henry Harrison?