7,306

[Math.]  73067 = 1,111,111,583,321,805,791,548,241,536.

 

7,312

[Math.]  The ratio 58496/7312 = 8, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #8.

 

7,329

[Math.]  The ratio 14658/7329 = 2, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #2.

 

7,331 & 7,333

[Math.]  A right-truncatable prime number: self, 733, 73 and 7 are prime numbers.

 

7,344

[Math.]  Two multiples of number 7344, 7344×4 = 29,376 and 7344×7 = 51,408, use each of 10 digits 0-9 once.

 

7,356

[Math.]  Two multiples of number 7356, 7356×5 = 36,780 and 7356×7 = 51,492, use each of 10 digits 0-9 once.

 

7,364

[Math.]  The ratio 58912/7364 = 8, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #8.

 

7,380

[Math.]  Sum (in degrees) of all internal angles of a 43-side polygon.

 

7,381

[Math.]  A triangular number (sum of all integers from 1 to 121):

7381 = 1+2+…+120+121 = 1+91+92+93+94.

 

7,385

[Math.]  The 15th Keith number: 7, 3, 8, 5, 23, 39, 75, 142, 279, 535, 1031, 1987, 3832, 7385, 14235…

 

7,393

[Math.]  A right-truncatable prime number: self, 739, 73 and 7 are prime numbers.

 

7,396

[Math.]  7396 = (73+96)2 = 862.