6647
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 7368
- Proper Divisor Sum (Aliquot Sum)
- 721
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5984
- Möbius Function
- 0
- Radical
- 391
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
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
- 119
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = (2*n - 11)*n^2.at n=17A015245
- Number of distinct products ijk with 0 <= i,j,k <= n.at n=47A027426
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 81.at n=6A031579
- Numbers whose base-9 representation has exactly 5 runs.at n=4A043634
- Numbers with a sum of digits equal to their greatest prime factor.at n=44A052021
- a(n) = floor(Pi*n^2).at n=46A066643
- a(n) = floor(surface area of a sphere with radius n).at n=22A066644
- Numbers n such that sum of digits of n equals the squarefree part of n.at n=43A070274
- a(1) = 6; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=45A074342
- a(n) = floor((n+2)^(n+2)/n^n).at n=29A078111
- Rounded base-2 logarithm of A082128(n).at n=25A082129
- Connell (3,5)-sum sequence (partial sums of the (3,5)-Connell sequence).at n=68A122796
- Number of intersections of at least four edges in a cube of n X n X n smaller cubes.at n=17A126562
- Difference between squares of legs of primitive Pythagorean triangles, sorted (with multiplicity).at n=21A127923
- Positive numbers of the form -x^4+6x^2 y^2-y^4 (where x,y are integers).at n=29A135790
- Numbers having exactly two distinct prime factors p, q with q = p+6.at n=25A143205
- Indices of 4's in A090822.at n=29A157107
- a(n) = (6 + 10*n + 5*n^2 + n^3)/2.at n=22A164845
- Concentric 23-gonal numbers.at n=34A195058
- Numbers with largest and smallest prime factors differing by 6.at n=32A195118