1518

1518 = 2 x 3 x 11 x 23.

1518 is a divisor of 47¹⁰ - 1.

1518 is the sum of its proper divisors that contain the digit 5: 1518 = 253 + 506 + 759.

1518 is the sum of two consecutive sums of consecutive numbers: 1518 = 121 + 122 + . . . + 131 + 132 = 133 + 134 + . . . + 142 + 143.

1518 is 2002020 in base 3. It is 330 in base 22.

Source: What's Special About This Number?