2226
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 5184
- Proper Divisor Sum (Aliquot Sum)
- 2958
- 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
- 624
- Möbius Function
- 1
- Radical
- 2226
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- no
- Narcissistic Number
- no
- Collatz Steps
- 138
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- 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 unrooted triangulations of a disk that have reflection symmetry with n interior nodes and 3 nodes on the boundary.at n=9A002712
- Number of chiral trees with n nodes.at n=12A005630
- Number of words of length n in a certain language.at n=26A005819
- Weighted count of partitions with distinct parts.at n=25A005895
- Maximal length of rook tour on an n X n board.at n=14A006071
- a(n) = (25*n^4-120*n^3+209*n^2-108*n)/6.at n=6A006529
- Coordination sequence T1 for Zeolite Code LEV.at n=35A008127
- Coordination sequence T5 for Zeolite Code -CLO.at n=42A009854
- Coordination sequence T2 for Zeolite Code -WEN.at n=34A009863
- Coordination sequence for MgNi2, Position Ni1.at n=12A009933
- Coordination sequence T3 for Zeolite Code OSI.at n=31A016432
- Powers of cube root of 18 rounded up.at n=8A018029
- a(n) = n*(31*n-1)/2.at n=12A022288
- Expansion of Product_{m>=1} (1+x^m)^3.at n=14A022568
- Place where n-th 1 occurs in A023131.at n=39A022793
- Sum of n-th Lucas number greater than 3 and n-th number that is 1 or is not a Fibonacci number.at n=13A023489
- a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 3) and d(n) = (n-th number that is 1 or is not a Lucas number).at n=13A023497
- a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 1) and d(n) = (n-th number that is 1, 2, or 3, or is not a Lucas number).at n=14A023501
- a(n) = [ (3rd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+2 positive integers congruent to 1 mod 3}.at n=7A024220
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = A001950 (upper Wythoff sequence).at n=52A025074