6813
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 9854
- Proper Divisor Sum (Aliquot Sum)
- 3041
- 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
- 4536
- Möbius Function
- 0
- Radical
- 2271
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 62
- 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
- sigma_3(n): sum of cubes of divisors of n.at n=17A001158
- Numbers k that divide s(k), where s(1)=1, s(j)=9*s(j-1)+j.at n=32A014857
- Numbers k such that Fib(k) == -34 (mod k).at n=40A023169
- Expansion of Molien series for 8-dimensional real Clifford group 2^{1+6}.Alt_8.2 of genus 3 and order 5160960.at n=44A024186
- Base 3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.at n=8A033139
- Sum of n-th powers of divisors of 18.at n=3A034661
- Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3.at n=4A037595
- First gap of n in sequence A038593 (upper terms).at n=17A038662
- Numbers ending with '3' that are the difference of two positive cubes.at n=16A038858
- a(n) = (n+3)^3 - n^3.at n=25A038865
- Roman numerals for n evaluated as if in Sallows' base 27.at n=2A073427
- Interprimes which are of the form s*prime, s=9.at n=19A075284
- Beginning with 1, numbers such that the differences a(k)-a(k-1) are distinct and every concatenation n>1 is prime.at n=39A090504
- a(0)=1, a(n) = sigma_3(2n).at n=9A091986
- a(0)=1, a(n) = sigma_3(3n).at n=6A092341
- a(n) = n * (10*n^2 - 6n + 1) = n * A087348(n).at n=9A104099
- Sum of the left diagonal in ordered 3 X 3 prime squares.at n=37A105090
- A skew generalized Pascal triangle.at n=52A112906
- Triangle read by rows: T(n,k) is the number of directed column-convex polyominoes of area n and height k (1<=k<=n; here by the height of a polyomino one means the number of lines of slope -1 that pass through the centers of the polyomino cells).at n=74A121298
- Numbers such that the sum of the factorials of the digits of the cube is a square.at n=27A126076