5806
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8712
- Proper Divisor Sum (Aliquot Sum)
- 2906
- 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
- 2902
- Möbius Function
- 1
- Radical
- 5806
- 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
- 142
- 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
- Coordination sequence T1 for Zeolite Code MTT.at n=47A008189
- 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 76.at n=2A031574
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 52 ones.at n=9A031820
- Numbers whose base-4 representation contains exactly two 1's and four 2's.at n=26A045099
- Consecutive terms of A065966 which are also consecutive integers.at n=17A065976
- Coordination sequence for ReO_3 net with respect to oxygen atom O_1.at n=44A066394
- a(n) = 3*n^2 - 2.at n=43A100536
- Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^(-6).at n=7A114358
- Triangle T, read by rows, where column k of matrix power T^( k(k+1)/2 ) equals left-shifted column (k-1) of T for k>=1.at n=21A126460
- Triangle T, read by rows, where column k of matrix power T^( k(k+1)/2 ) equals left-shifted column (k-1) of T for k>=1.at n=22A126460
- Column 0 of triangle A126460; equals the number of subpartitions of the partition {(k^2 + 3*k - 4)*k/6, k>=0}.at n=6A126461
- Number of bits in A127962(n).at n=23A127965
- Expansion of x/((1 - x - x^4)*(1 - x)^6).at n=10A145135
- Number of binary strings of length n with no substrings equal to 0000 0111 or 1001.at n=14A164442
- Semiprimes s such that phi(s)/2 is prime.at n=48A194593
- G.f.: 1/(1-2*x+2*x^2-x^3+x^4).at n=31A199802
- G.f.: 1/(1 + x - x^2 - x^3 + x^4).at n=32A199803
- Trisection 1 of A199802.at n=10A199928
- a(n) = floor(e^(n/3)).at n=25A214077
- Number T(n,k) of equivalence classes of ways of placing k 4 X 4 tiles in an n X n square under all symmetry operations of the square; irregular triangle T(n,k), n>=4, 0<=k<=floor(n/4)^2, read by rows.at n=41A236757