Numbers 520,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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521,640

[Math.]  Two consecutive sums of consecutive numbers:

6400+…+6480 = 6481+…+6560 = 521,640.

 

522,405

[Math.]  A pair of amicable numbers (522405, 525915).

 

523,809

[Math.]  Multiples of 047619 (= 095238/2) by 2, 5, 8, 11, 17 and 20 yield all 6 rotations of the digits of 095238 (the period of the rational number 2/21 = 0.095238095238… or 0.095238): 095238, 238095, 380952, 523809, 809523 and 952380, respectively.

 

524,287

[Math.]  The 7th Mersenne prime number: 219–1.

 

525,600

[Calendar]  The number of minutes in a calendar non-leap (365-day) year.

 

[Math.]  Sum (in degrees) of all internal angles of a 2922-side polygon.

 

525,625

[Math.]  525,625 = 7252.

 

525,915

[Math.]  A pair of amicable numbers (522405, 525915).

 

525,948

[Calendar]  The number of minutes (525,948.7579) in a tropical year.

 

525,960

[Calendar]  The average number of minutes in a year by the Julian calendar.

 

[Math.]  Sum (in degrees) of all internal angles of a 2924-side polygon.

 

525,969

[Calendar]  The number of minutes (525,969.1584) in a sidereal year.

 

527,040

[Calendar]  The number of minutes in a calendar leap (366-day) year.

 

[Math.]  Sum (in degrees) of all internal angles of a 2930-side polygon.

 

528,529

[Math.]  A square number 7272 = 528,529, formed by concatenation of 2 consecutive numbers.