Numbers 1,400,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

1,000,000 1,100,0001,200,000 – 1,300,0001,400,000

1,500,0001,600,0001,700,0001,800,0001,900,000

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1,413,721 

[Math.]  The 5th square number that is also a triangular number: 11892 = 1+2+…+1,681 = 1,413,721. Each root number in the series is 6 times the previous root number minus the earlier root number: 1, 62, 352, 2042, 11892

 

1,419,869

[Math.]  1,419,869 = 135+165 = 175+12 (very close to Fermat’s Last Theorem) and and 13+16 = 17+12 = 29.

 

1,428,570

[Math.]  142,857×10 = 1,428,570 and 1+428,570 = 428,571, a digit-rotation of 142,857.

 

1,428,571

[Math.]  A prime number.

 

[Math.]

1×7 + 3 = 10

14×7 + 2 = 100

142×7 + 6 = 1000

1428×7 + 4 = 10000

14285×7 + 5 = 100000

142857×7 + 1 = 1000000

 

1428571×7 + 3 = 10000000

14285714×7 + 2 = 100000000

142857142×7 + 6 = 1000000000

1428571428×7 + 4 = 10000000000

14285714285×7 + 5 = 100000000000

142857142857×7 + 1 = 1000000000000

 

1428571428571×7 + 3 = 10000000000000

 

 

1,438,983

[Math.]  A pair of amicable numbers (1175265, 1438983).

 

1,441,889

[Math.]  A Markov number.

 

1,456,789

[Math.]  Number 01,456,789 misses 2 digits 2 and 3 in 10 digits 0-9:

01,456,789×2 = 02,913,578 misses 2 digits 4 and 6 (modulo 9)

01,456,789×5 = 07,283,945 misses 2 digits 1 and 6 (modulo 9).

 

1,461,537

[Math.]  076,923×19 = 1,461,537 and 1+461,537 = 461,538, a digit-rotation of 153,846 = 076,923×2.

 

1,464,592

[Math.]  A pair of amicable numbers (1392368, 1464592).

 

1,466,150

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

 

1,468,324

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

 

1,483,850

[Math.]  A pair of amicable numbers (1328470, 1483850).

 

1,486,845

[Math.]  A pair of amicable numbers (1358595, 1486845).