1212 (szám)

Ez a szócikk az ezerkétszáztizenkettes számról szól. Az 1212. évről szóló cikket lásd itt: 1212.
1212
(ezerkétszáztizenkettő)
… 1209 1210 1211 « 1212 » 1213 1214 1215 …
Tulajdonságok
Normálalak1,212 · 103
Kanonikus alak22 · 31 · 1011
Osztók1, 2, 3, 4, 6, 12, 101, 202, 303, 404, 606, 1212
Római számmalMCCXII
Számrendszerek
Bináris alak100 1011 11002
Oktális alak22748
Hexadecimális alak4BC16
Számelméleti függvények értékei
Euler-függvény400
Möbius-függvény0
Mertens-függvény−1
Osztók száma12
Osztók összege2856
bővelkedő szám
Valódiosztó-összeg1643

Az 1212 (római számmal: MCCXII) az 1211 és 1213 között található természetes szám.

A szám a matematikában

A tízes számrendszerbeli 1212-es a kettes számrendszerben 10010111100, a nyolcas számrendszerben 2274, a tizenhatos számrendszerben 4BC alakban írható fel.

Az 1212 páros szám, összetett szám. Kanonikus alakja 22 · 31 · 1011, normálalakban az 1,212 · 103 szorzattal írható fel. Tizenkét osztója van a természetes számok halmazán, ezek növekvő sorrendben: 1, 2, 3, 4, 6, 12, 101, 202, 303, 404, 606 és 1212.

Érinthetetlen szám: nem áll elő pozitív egész számok valódiosztóösszeg-függvényeként.[1]

Csillagászat

Források

Jegyzetek

  1. ↑ Sloane's A005114 : Untouchable numbers. The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. (Hozzáférés: 2016. május 29.)

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