1206
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 9
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 2652
- Proper Divisor Sum (Aliquot Sum)
- 1446
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 396
- Möbius Function
- 0
- Radical
- 402
- 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
- no
Recreational
- Happy Number
- no
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 70
- Smith Number
- no
- Vampire 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
Appears in sequences
- Number of partitions of n into at most 6 parts.at n=30A001402
- Quadrinomial coefficients.at n=7A005719
- G.f.: Product_{k>=1} (1 + x^(2*k - 1)) / (1 - x^(2*k)).at n=31A006950
- Some permutation of digits is a cube.at n=46A007939
- Noncubes such that some permutation of digits is a cube.at n=36A007940
- Co-growth function of a certain group.at n=7A007985
- Coordination sequence T2 for Zeolite Code JBW.at n=23A008122
- Coordination sequence T3 for Zeolite Code LIO.at n=24A008131
- Coordination sequence T2 for Zeolite Code MAZ.at n=24A008145
- Coordination sequence T1 for Zeolite Code ATO.at n=23A008265
- If a, b in sequence, so is a*b+2.at n=45A009299
- Coordination sequence T2 for Zeolite Code VET.at n=21A009903
- Coordination sequence for FeS2-Marcasite, Fe position.at n=17A009955
- [ sqrt(3/2)^n ].at n=35A014215
- a(1) = 1, a(2) = 2, a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-2)*a(2) for n >= 3.at n=8A014431
- Number of digraphs with unlabeled (non-isolated) nodes and n labeled edges.at n=4A014505
- a(1) = 1, a(n) = Sum_{k=1..n-1} Sum_{d|k} a(d).at n=10A014668
- Irreducible quadruple Euler sums of weight 2n+10 (verified for n <= 14).at n=38A019449
- Vampire numbers: (definition 1): n has a nontrivial factorization using n's digits.at n=3A020342
- a(n)-th squarefree is sum of first k squarefrees for some k.at n=29A020643