6836
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 11970
- Proper Divisor Sum (Aliquot Sum)
- 5134
- 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
- 3416
- Möbius Function
- 0
- Radical
- 3418
- 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
- 57
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) = prime(n) + Fibonacci(n).at n=19A004397
- Representation degeneracies for boson strings.at n=28A005293
- Numbers k such that the continued fraction for sqrt(k) has period 86.at n=15A020425
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 42 ones.at n=30A031810
- Numbers k such that 177*2^k+1 is prime.at n=44A032465
- Number of partitions satisfying (cn(1,5) <= cn(2,5) and cn(1,5) <= cn(3,5) and cn(4,5) <= cn(2,5) and cn(4,5) <= cn(3,5)).at n=41A036803
- Number of 1-punctured staircase polygons (by perimeter) with a hole of perimeter 6.at n=13A055024
- a(n) = Sum_{i=1..n} LookAndSay(i).at n=15A079664
- Numbers k such that k + sum_of_digits(k) is a cube.at n=16A084661
- Number of partitions of n in which the sequence of frequencies of the summands is nondecreasing.at n=35A100883
- Coordination sequence for octagonal tiling is a(n) + A103908(n)*sqrt(2).at n=24A103909
- Sum of ordered 3 prime sided prime triangles.at n=31A105100
- Numbers n such that n + sigma(n) + phi(n) is a repdigit.at n=13A116029
- Number of AT-free Berge perfect graphs on n nodes.at n=7A123406
- Numbers k such that the sum of the first k primes is prime and the sum of the squares of the first k primes is also prime.at n=31A124225
- Exponent of least power of 2 having exactly n consecutive 8's in its decimal representation.at n=7A131542
- Number of different strings of length n+5 obtained from "123...n" by iteratively duplicating any substring.at n=9A137740
- Partial sums of A106116.at n=36A173112
- Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>=n.at n=19A211641
- Number of (w,x,y,z) with all terms in {1,...,n} and w*x < 2*y*z.at n=10A211795