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Numbers 19,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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19,023

[Math.]  190232 = 361,874,529, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

 

19,076

[Math.]  Two multiples of number 4769, 4769×4 = 19,076 and 4769×5 = 23,845, use each of 10 digits 0-9 once.

 

19,083

[Math.]  6,963,472,309,248 = 102003+180723 = 24213+190833 = 133223+166303 = 54363+189483.

 

19,116 & 19,916

[Math.]  The 2nd known amicable/sociable number chain: 14316 → 19116 → 31704 → 47616 → 83328 → 177792 → 295488 → 629072 → 589786 → 294896 → 358336 → 418904 → 366556 → 274924 → 275444 → 243760 → 376736 → 381028 → 285778 → 152990 → 122410 → 97946 → 48976 → 45946 → 22976 → 22744 → 19916 → 17716 → 14316. (of 28 links, currently the longest, found by Poulet, 1918)

 

19,200

[Tech.]  One of standardized baud rate (bits per second) in electronic data transmissions.

 

19,244 & 19,255

[Zip]  U.S. Postal Zip Code: Philadelphia, Pennsylvania 19244 & 19255 are only 2 zip codes starting with 192.

 

19,258

[Math.]  Two multiples of number 9629, 9629×2 = 19,258 and 9629×7 = 67,403, use each of 10 digits 0-9 once. 

 

19,377

[Math.]  193772 = 375,468,129, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

 

19,391

[Math.]  Circular prime numbers: all 5 numbers 91193, 11939, 19391, 93911 and 39119 are prime.

 

19,560

[Math.]  Two multiples of number 3912, 3912×5 = 19,560 and 3912×7 = 27,384, use each of 10 digits 0-9 once.

 

19,569

[Math.]  195692 = 382,945,761, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

 

19,600

[Math.]  Six square numbers using the same digits: 1302 = 16900, 1402 = 19600, 3102 = 96100, 1032 = 10609, 2472 = 61009 and 3012 = 90601.

 

[Math.]   The only tetrahedral number that is also a square: 19600 = 1+3+6+10+15+…+1176 =1402, except the trivial case: 4 = 22 = 1+3).

 

19,602

[Math.]  Two multiples of number 6534, 6534×3 = 19,602 and 6534×7 = 45,738, use each of 10 digits 0-9 once.

 

19,606

[Zip]  U.S. Postal Zip Code: Five Points, Pennsylvania 19606.

 

19,629

[Math.]  196292 = 385,297,641, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

 

19,683

[Math.]  19,683 = (1+9+6+8+3) = 273 = 39.

 

19,708

[Math.]  Two multiples of number 4927, 4927×4 = 19,708 and 4927×5 = 24,635, use each of 10 digits 0-9 once. 

 

19,753

[Math.]  One of only 2 prime numbers, formed by all 5 odd digits. The other is 53197.

 

19,756

[Astronomy]  The average period (days) that eclipses tend to repeat at a location on the Earth: 3 Saros cycles (about 54 years 1 month) or 19756 days.

 

19,764

[Math.]  Two multiples of number 3294, 3294×6 = 19,764 and 3294×7 = 23,058, use each of 10 digits 0-9 once.

 

19,820

[Tech.]  The number of airports of all types in the U.S. in the year 2004.

 

19,855

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

552+562+572+582+592+602 = 19,855 = 612+622+632+642+652. 

 

19,916 & 19,116 

[Math.]  The 2nd known amicable/sociable number chain: 14316 → 19116 → 31704 → 47616 → 83328 → 177792 → 295488 → 629072 → 589786 → 294896 → 358336 → 418904 → 366556 → 274924 → 275444 → 243760 → 376736 → 381028 → 285778 → 152990 → 122410 → 97946 → 48976 → 45946 → 22976 → 22744 → 19916 → 17716 → 14316. (of 28 links, currently the longest, found by Poulet, 1918)

 

19,937

[Math.]  A prime number.  A Mersenne exponent: 219937–1 is the 24th Mersenne prime number.

 

19,937

[Math.]  Circular prime numbers: all 5 numbers 93719, 37199, 71993, 19937 and 99371 are prime.

 

19nnn

[Zip]  U.S. Postal Zip Codes of Pennsylvania: 15nnn-18nnn and 190nn-196nn.

U.S. Postal Zip Codes of Delaware: 197nn-199nn.