9841
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10612
- Proper Divisor Sum (Aliquot Sum)
- 771
- 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
- 9072
- Möbius Function
- 1
- Radical
- 9841
- Omega Function (Ω)
- 2
- 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
- 42
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- no
- Odd
- yes
Appears in sequences
- Hexanacci numbers with a(0) = ... = a(5) = 1.at n=17A000383
- Centered 12-gonal numbers, or centered dodecagonal numbers: numbers of the form 6*k*(k-1) + 1.at n=40A003154
- a(n) = (3^n - 1)/2.at n=9A003462
- a(n) = (n + 3)*(n^2 + 6*n + 2)/6.at n=36A005286
- Number of free subsets of multiplicative group of GF(3^n).at n=8A007231
- Pseudoprimes to base 28.at n=32A020156
- Strong pseudoprimes to base 27.at n=13A020253
- Gaussian binomial coefficients [ n,8 ] for q = 3.at n=1A022199
- Plaindromes: numbers whose digits in base 3 are in nondecreasing order.at n=45A023745
- Least m such that if r and s in {1/3, 1/6, 1/9, ..., 1/3n} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=43A024838
- Arrange digits of squares in descending order.at n=43A028908
- Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 20 (most significant digit on right).at n=17A029513
- Smaller of a pair of consecutive lucky numbers with a gap of 2n.at n=20A031884
- a(n) = floor((n^3)/2).at n=27A036487
- Numbers whose maximal base-9 run length is 4.at n=19A037999
- Number of sublattices of index n in generic 9-dimensional lattice.at n=2A038996
- Triangle of B-analogs of Stirling numbers of the second kind.at n=46A039755
- Triangle of B-analogs of Stirling numbers of 2nd kind.at n=53A039756
- Denominators of continued fraction convergents to sqrt(858).at n=6A042657
- Numbers having four 4's in base 9.at n=1A043472