6886
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 11304
- Proper Divisor Sum (Aliquot Sum)
- 4418
- 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
- 3120
- Möbius Function
- -1
- Radical
- 6886
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 57
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Sum of cubes of primes dividing n.at n=56A005064
- Sum of cubes of odd primes dividing n.at n=56A005067
- Sum of cubes of primes = 3 mod 4 dividing n.at n=56A005084
- Coordination sequence for sigma-CrFe, Position Xb.at n=21A009960
- Palindromic in bases 9 and 10.at n=16A029965
- 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 82.at n=11A031580
- Number of partitions of 5n such that cn(1,5) = cn(4,5) <= cn(0,5) = cn(2,5) = cn(3,5).at n=12A036889
- Denominators of continued fraction convergents to sqrt(611).at n=12A042173
- Base-9 palindromes that start with 1.at n=24A043028
- Base-10 palindromes that start with 6.at n=20A043041
- Palindromic even lucky numbers.at n=21A045960
- Palindromes with exactly 3 prime factors (counted with multiplicity).at n=44A046329
- Palindromes with exactly 3 palindromic prime factors (counted with multiplicity).at n=15A046377
- Palindromes with exactly 3 distinct prime factors.at n=29A046393
- Palindromes with exactly 3 distinct palindromic prime factors.at n=6A046409
- a(n) = Sum_{d|n, n/d=3 mod 4} d^3.at n=56A050466
- Consider all integer triples (i,j,k), j,k>0, with binomial(i+2,3)=binomial(j+2,3)+k^3, ordered by increasing i; sequence gives i values.at n=31A054221
- A054221 without cubes.at n=13A054224
- Palindromic numbers with even digits.at n=43A062287
- Potential Sierpiński numbers: integers for which the smallest m > 2^10 in A040076 such that n*2^m+1 is prime (A050921).at n=23A064721