Numbers 13,000,000s

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]

1  - 10 - 100  - 1000 - 10,000 - 100,000 - 1M - 10M - 100M1B10B - 100B - 1T - 10T - 100T - 1Q ...

13,136,528

[Math.]  A pair of amicable numbers (12397552, 13136528).

 

13,212,076

[Math.]  A pair of amicable numbers (11173460, 13212076).

 

13,213,225

Math.]  36352 = 13,213,225.

 

13,333,334

[Math.]  133,333,346,666,667 = 13,333,3342–6,666,6672 = (13333334+6666667)×6666667.

 

13,337,336

[Math.]  A pair of amicable numbers (11905504, 13337336).

 

13,359,025

[Math.]  Sum of the first 85 cube numbers:

13+23+…+843+853 = 13,359,025 = (1+2+…+84+85)2 = 36552.

 

13,456,789

[Math.]  Number 13,456,789 misses one digit 2 in 9 digits 1-9:

13,456,789×2 = 26,913,578 misses one digit 4 (modulo 9)

13,456,789×5 = 67,283,945 misses one digit 1 (modulo 9).

 

13,466,917 

[Math.]  A prime number. A Mersenne exponent: 213,466,917–1 is the 39th Mersenne prime number.

 

13,560,000

[Tech.]  A frequency used by contact-less smart card technology: 13.56 MHz. A frequency used by proximity card technology: 125 kHz.

 

13,636,361

[Math.]  Repeatedly inserting numbers 36 in the middle of the prime number 11 yields other prime numbers: 1361, 136,361, 13,636,361, 1,363,636,361 and 136,363,636,361.

 

13,642,207

[Math.]  A prime number, formed by 2 consecutive Lucas numbers, 1364 and 2207.

 

13,671,735

[Math.]  A pair of amicable numbers (13671735, 15877065).

 

13,682,601

[Math.]

692 = 136,161

36992 = 13682601

369992 = 1368926001

3699992 = 136899260001

36999992 = 13689992600001

369999992 = 1368999926000001

3366992 = 113366,216601

336699992 = 11336688,32660001

33669999992 = 1133668899,3266000001

3366999999992 = 113366889999,326600000001

333,666,9992 = 111,333,666,221,666,001

333,666,999,9992 = 111,333,666,888,332,666,000,001

333,666,999,999,9992 = 111,333,666,888,999,332,666,000,000,001

3333,6666,99992 = 1111,3333,6666,2221,6666,0001

3333,6666,9999,99992 = 1111,3333,6666,8888,3332,6666,0000,0001.

...

 

13,745,725

[Math.]  A printer’s error number: 13,745,725 = 13745725 = 13×74×5725.  It is still true for 0’s added to the right side of the number. (by B. J. van der Zwaag, References [17])

 

13,813,150

[Math.]  A pair of amicable numbers (13813150, 14310050).

 

13,845,841

[Math.]  13,845,841 = (1+38+4+5+8+4+1)4 = 614.

 

13,921,528

[Math.]  A pair of amicable numbers (13921528, 13985672).

 

13,942,125

[Math.]  A printer’s error number: 13,942,125 = 13942125 = 13×94×2125.  It is still true for 0’s added to the right side of the number. (by B. J. van der Zwaag, References [17])

 

13,985,672

[Math.]  A pair of amicable numbers (13921528, 13985672).

 

13,995,081

[Math.]  Sum of the first 86 cube numbers:

13+23+…+853+863 = 13,995,081 = (1+2+…+85+86)2 = 37412 

 

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.