1,714,284

[Math.]  142,857×12 = 1,714,284 and 1+714,284 = 714,285, a digit-rotation of 142,857.

 

1,747,930

[Math.]  A pair of amicable numbers (1466150, 1747930).

 

1,749,212

[Math.]  A pair of amicable numbers (1468324, 1749212).

 

1,758,276

[Math.]  Sum of the first 51 cube numbers:

1³+2³+…+50³+51³ = 1,758,276 = (1+2+…+50+51)² = 1326².

 

1,769,229

[Math.]  076,923×23 = 1,769,229 and 1+769,229 = 769,230, a digit-rotation of 076,923.

 

1,771,561

[Math.]  1,771,561 = (17–7+1–5+6–1)⁶ = 11⁶.

 

1,789,515

[Math.]  Two consecutive sums of consecutive square numbers:

1,789,515 = 351²+352²+…+363²+364² = 365²+366²+…+376²+377².

 

1,798,875

[Math.]  A pair of amicable numbers (1798875, 1870245).