1860

1860 = 2 x 2 x 3 x 5 x 31.

1860 is the number of ways to 12-color the faces of a tetrahedron (A006008).

1860 uses each of the digits from 0 to 4 once in its representation in base 6 (12340). It is 1441 in base 11.

1860 is equal to the sum of the squares of its first 11 divisors (A185584): 1860 = 1² + 2² + 3² + 4² + 5² + 6² + 10² + 12² + 15² + 20² + 30².

1860 divides 61² - 1.

1860 is a year that had five Wednesdays in the month of February (A141039).

Source: What's Special About This Number?