190

This number is a composite.

190 is the largest number with only distinct prime Roman numeral palindrome factors that is itself a Roman numeral palindrome (190 = CXC = II * V * XIX). [Thoms]

In April of 2010, Eric Weisstein announced that the number obtained by starting with 37765 and adjoining to the right each decremented number down to 1 is prime. The number 190 occurs 190 times in this number. Aside from 1, the only other numbers that divide the number of times they occur are the primes 7, 37, 47, and 73. [Merickel]