812
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 1680
- Proper Divisor Sum (Aliquot Sum)
- 868
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 336
- Möbius Function
- 0
- Radical
- 406
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- yes
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 41
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- achthundertzwölf· ordinal: achthundertzwölfste
- English
- eight hundred twelve· ordinal: eight hundred twelfth
- Spanish
- ochocientos doce· ordinal: 812º
- French
- huit cent douze· ordinal: huit cent douzième
- Italian
- ottocentododici· ordinal: 812º
- Latin
- octingenti duodecim· ordinal: 812.
- Portuguese
- oitocentos e doze· ordinal: 812º
Appears in sequences
- Numbers beginning with letter 'e' in English.at n=25A000873
- a(n) = (3*n+1)*(3*n+2).at n=9A001504
- a(n) = n*(n + 1)*(n^2 + n + 2)/4.at n=7A001621
- Shuffling 2n cards.at n=43A002139
- Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1).at n=28A002378
- a(n) = n*phi(n).at n=28A002618
- Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n^2/4).at n=57A002620
- a(n) = floor(n(n+2)(2n+1)/8).at n=14A002717
- a(n) = 2*n*(2*n+1).at n=14A002943
- Beginnings of periodic unitary aliquot sequences.at n=70A003062
- a(n) = floor(n*phi^7), where phi is the golden ratio, A001622.at n=28A004922
- Number of points on surface of cuboctahedron (or icosahedron): a(0) = 1; for n > 0, a(n) = 10n^2 + 2. Also coordination sequence for f.c.c. or A_3 or D_3 lattice.at n=9A005901
- a(n) = Sum_{k=1..n-1} k XOR n-k.at n=35A006582
- Consider Leibniz's harmonic triangle (A003506) and look at the non-boundary terms. Sequence gives numbers appearing in denominators, sorted.at n=37A007622
- Coordination sequence T1 for Zeolite Code LOV.at n=19A008134
- Coordination sequence T3 for Zeolite Code LOV.at n=19A008136
- Coordination sequence T1 for Zeolite Code MEP.at n=17A008157
- Coordination sequence T2 for Zeolite Code MFI.at n=18A008165
- Coordination sequence T7 for Zeolite Code NES.at n=18A008211
- Coordination sequence for diamond.at n=18A008253