247 = 13 x 19. Its digits sum to the smallest prime factor: 2 + 4 + 7 = 13.
247 is a pentagonal number.
247 is the smallest possible difference between two integers that together contain each digit exactly once: 247 = 50,123 - 49876.
2472 is one of six square numbers that use the same digits: 2472 = 61,009; 1302 = 16.900; 1402 = 19,600; 3102 = 96,100; 1032 = 10,609; and 3012 = 90,601.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5Wmi7AoRxlDcZ0I_hMMQyQOD6EsuoFPj0cbg3rZv7H_IGCkCpOZzRJd43b0MzPH_BfblRpsbj2e8P3GF_2zHUWGT7MgZb2LtAQIlB1RUfQ8wu0eC2F5t-wrzS8KgQpVDfiYcmsAEShh4/s200/n0247.jpg)
Source: Prime Curios!