6176
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 12222
- Proper Divisor Sum (Aliquot Sum)
- 6046
- 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
- 3072
- Möbius Function
- 0
- Radical
- 386
- Omega Function (Ω)
- 6
- 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
- 124
- 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
- Number of points on surface of truncated tetrahedron: a(n) = 14*n^2 + 2 for n > 0, a(0)=1.at n=21A005905
- a(n) = least m such that if r and s in {1/1, 1/3, 1/5, ..., 1/(2n-1)} satisfy r < s, then r < k/m < (k+2)/m < s for some integer k.at n=34A024841
- Exactly half of first a(n) terms of A022300 are 1's (not known to be infinite).at n=41A025513
- Number of plane regions after drawing (in general position) a convex n-gon and all its diagonals.at n=19A027927
- 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 39.at n=19A031537
- Numbers whose base-4 representation contains exactly four 0's and two 2's.at n=17A045059
- Numbers k that divide 10^k + 4^k.at n=23A045594
- First differences are A005563.at n=25A047732
- Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2) = k; sequence gives values of k.at n=38A048191
- a(n) = T(2n-1,n), array T given by A048201.at n=39A048208
- Second pentagonal numbers with even index: a(n) = n*(6*n+1).at n=32A049453
- a(n) is the sum of all integers from 2^(n-2)+1 to 2^(n-1).at n=6A049775
- Numbers n such that n^2 contains exactly 8 different digits.at n=39A054036
- a(n) = T(n,n-4), array T as in A055801.at n=39A055804
- Number of periodic palindromic structures of length n using a maximum of two different symbols.at n=25A056503
- Centered 19-gonal numbers.at n=25A069132
- Smallest multiple of the n-th prime such that the n-th partial sum is divisible by n.at n=43A074105
- Least nontrivial multiple of the n-th prime beginning with 6.at n=43A078290
- a(n) = floor(e*(n+3)!) - (n+3)*(n+2)*(n+1)*n*floor(e*(n-1)!).at n=15A080770
- Sum of primitive roots of n-th prime.at n=43A088144