Numbers 18,000,000s

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 ...

18,017,056

[Math.]  A pair of amicable numbers (17908064, 18017056).

 

18,056,312

[Math.]  A pair of amicable numbers (18056312, 18166888).

 

18,087,818

[Math.]  A pair of amicable numbers (14426230, 18087818).

 

18,095,112

[Math.]  18,095,112 = 6762´2676 = 4683×3864.

 

18,166,888

[Math.]  A pair of amicable numbers (18056312, 18166888).

 

18,194,715

[Math.]  A pair of amicable numbers (18194715, 22240485).

 

18,243,225

[Math.]  The infinite sum Sn(1/n14) = p14×2/18243225 = z(14), where n runs over all positive integers and z(s) is the Riemann zeta function over complex variable s.

 

18,301,284

[Math.]  Sum of the first 92 cube numbers:

13+23+…+913+923 = 18,301,284 = (1+2+…+91+92)2 = 42782.

 

18,359,495

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

18,359,495 = 9032+…+9242 = 9252+…+9452.

 

18,655,744

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

 

18,974,376

[Math.]  18,974,376 = (1–8 –9+7–4+3+76)4 = 664.

 

18,974,376

[Math.]

(*)   8712 = 2178×4 & 8712×2178 = 18,974,736 = 43562 (= 664)

8712…8712 = 2178…2178×4 & 8712…8712×2178…2178 = 4356…43562.

 

(**)   87912 = 21978×4 & 21978×87912 = 1,932,129,936 = 439562

87912…87912 = 21978…21978×4 & 21978…21978×87912…87912 = 43956…439562.

 

(***)   87999912 = 21999978×4 & 21999978×87999912 = 439999562

87999912…87999912 = 21999978…21999978×4 &

21999978…21999978×87999912…87999912 = 43999956…439999562.

 

(****)   879…912 = 219…978×4 & 219…978×879…912 = 439…9562

879…912…879…912 = 219…978…219…978×4 &

            219...978...219...978×879...912...879...912 = 439...956...439...9562.

 

18,974,376

[Math.]  (1+2+…+11)4 = [(15+25+…+115)+(17+27+…+117)]/2.

 

18,983,449

[Math.]  43572 = 1898,3449 and 1898+3449 = 5347.

 

 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.