6866
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10302
- Proper Divisor Sum (Aliquot Sum)
- 3436
- 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
- 3432
- Möbius Function
- 1
- Radical
- 6866
- 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
- 150
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 17.at n=37A020356
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 2 (most significant digit on left).at n=31A029447
- Numbers n such that there are equal numbers of 0's and 1's in first n digits of binary representation of Pi.at n=40A039624
- Numbers having three 6's in base 10.at n=31A043515
- Product of two triangular matrices C*S2.at n=16A064308
- a(n) = n^3 + 7.at n=19A084377
- Near-repdigit semiprimes with 6 as repeated digit.at n=18A105987
- Number of permutations of length n which avoid the patterns 2314, 3241, 4132.at n=8A116796
- Semiprimes which are divisible by their multiplicative digital root.at n=42A118696
- Semiprimes that are semiprimes turned upside-down.at n=41A119738
- A functionally symmetric Polynomial as a triangle of coefficients: p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n - 4)*Sum[(2^m + 2*m + 2)*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]].at n=59A146954
- a(n) = prime(n)^2 - n.at n=22A182174
- Number of ordered triples (w,x,y) with all terms in {-n, ..., -1, 1, ..., n} and 5w + x + y > 0.at n=12A211630
- Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|<|x-y|<|y-z|.at n=14A212902
- Number of 5 X n 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=11A224041
- Numbers k such that m^2 + k^2/m^2 is prime for every m|k.at n=39A236423
- Natural numbers n that have the property that starting from k = n, the fixed point of the map k -> floor(tan(k)) is strictly positive, while the smallest number encountered during the iteration is strictly negative.at n=42A258202
- Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111.at n=8A260131
- T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111.at n=36A260138
- Numbers k such that Sum_{i=1..k} sigma(i)^d(i) == 0 (mod k), where sigma = A000203 and d = A000005.at n=12A260654