Numbers 19,000,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

10,000,000 11,000,00012,000,00013,000,000 – 14,000,000

15,000,00016,000,00017,000,00018,000,00019,000,000

All Numbers  & [1M] & [10M- [20M] - [30M] - [40M] - [50M] - [60M] - [70M] - [80M] - [90M]  &  [100M]

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19,105,641

[Math.]  Sum of the first 93 cube numbers:

13+23+…+923+933 = 19,105,641 = (1+2+…+92+93)2 = 43712.

 

19,150,222

[Math.]  A pair of amicable numbers (17041010, 19150222).

 

19,154,336

[Math.]  A pair of amicable numbers (18655744, 19154336).

 

19,325,698

[Math.]  A pair of amicable numbers (16871582, 19325698).

 

19,487,171

[Math.]  19,487,171 = (19–4+8–7+1–7+1)7 = 117.

 

19,748,225

[Math.]  A printer’s error number: 19,748,225 = 19748225 = 19×74×8225.

It is still true for 0’s added to the right side of the number. (by B. J. van der Zwaag, References [17])

 

 19,749,136

[Math.] 

 121×(1+2+1) = 484 = 222

12,321×(1+2+3+2+1) = 110,889 = 3332

12,34,321×(1+2+3+4+3+2+1) = 19,749,136 = 4,4442

123,454,321×(1+2+3+4+5+4+3+2+1) = 3,086,358,025 = 55,5552

12,345,654,321×(1+2+3+4+5+6+5+4+3+2+1) = 444,443,555,556 = 666,6662

1,234,567,654,321×(1+2+3+4+5+6+7+6+5+4+3+2+1) =

= 60,493,815,061,729 = 7,777,7772

123,456,787,654,321×(1+2+3+4+5+6+7+8+7+6+5+4+3+2+1) =

= 7,901,234,409,876,544 = 88,888,8882

12,345,678,987,654,321×(1+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1)

= 999,999,998,000,000,001 = 999,999,9992.

 

 

19,895,265

[Math.]  A pair of amicable numbers (17844255, 19895265).

 

19,902,511

[Math.]  19,902,511 = (1+9+9+0+251+1)3 = 2713.

 

19,936,225

[Math.]  Sum of the first 94 cube numbers:

13+23+…+933+943 = 19,936,225 = (1+2+…+93+94)2 = 44652.

 

19,985,355

[Math.]  A pair of amicable numbers (17754165, 19985355).

 

19,998,989--19,999,012

[Math.]  All numbers in the range [19,998,989-19,999,012]  have all their 404th, 414th, 424th, 434th, 444th and 454th powers starting with digits 404, 414, 424, 434, 444 and 454, respectively.

 

xy,abc,def 

[Math.]  For any xy = 10 to 99, there are always six 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 6 digit-rotations of 142,857 and the number xy,abc,def is a multiple of 142,857.

 

For any xy = 10 to 99, there are always twelve 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number xy,abc,def is a multiple of 76,923.