703

Number
$703$ (seven hundred and three) is:


 * $19 \times 37$


 * The $37$th triangular number:
 * $703 = \dfrac {37 \times \left({37 + 1}\right)} 2$


 * The $7$th Kaprekar number after $1, 9, 45, 55, 99, 297$:
 * $703^2 = 494 \, 209 \to 494 + 209 = 703$