9866
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 29
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14802
- Proper Divisor Sum (Aliquot Sum)
- 4936
- 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
- 4932
- Möbius Function
- 1
- Radical
- 9866
- 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
- 135
- 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
- yes
- Odd
- no
Appears in sequences
- Number of words of length n in a certain language.at n=44A005819
- a(n) = floor( n*(n-1)*(n-2)/23 ).at n=62A011905
- Numbers k such that the continued fraction for sqrt(k) has period 29.at n=28A020368
- Expansion of (1 - 3*x) / (1 - 5*x + 3*x^2).at n=7A052961
- Self-reciprocating sequence: the integer part of powers of the reciprocal sum.at n=15A066173
- Sum of proper divisors of the number of partitions of n.at n=33A139055
- Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,0 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155415
- Number of 6X6 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.at n=26A156389
- Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 26.at n=4A156485
- Number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=14A207144
- Number of (n+1) X 6 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=12A207146
- Row sums of the triangle in A208101.at n=14A208976
- Number of length 3 0..n arrays with each partial sum starting from the beginning no more than one standard deviation from its mean.at n=28A244791
- Number A(n,k) of tilings of a k X n rectangle using polyominoes of shape I; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=47A254414
- Number A(n,k) of tilings of a k X n rectangle using polyominoes of shape I; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=52A254414
- Number of tilings of a 7 X n rectangle using polyominoes of shape I.at n=2A254607
- a(n) is the position of the first occurrence of n^3 in the concatenation of the positive integers in decimal representation.at n=13A290787
- a(n)^2 is the start of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=32A340663