6437
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6636
- Proper Divisor Sum (Aliquot Sum)
- 199
- 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
- 6240
- Möbius Function
- 1
- Radical
- 6437
- 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
- 75
- 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
- no
- Odd
- yes
Appears in sequences
- Number of nonisomorphic minimal triangle graphs.at n=11A000080
- Numbers k such that k*(k+1)/2 + 1 is a square.at n=10A006451
- Triangulations of a square with no separating triangles (previously "Bordered triangulations of sphere with n nodes").at n=8A006674
- Denominators of continued fraction convergents to sqrt(734).at n=8A042413
- Numerators of continued fraction convergents to sqrt(967).at n=4A042870
- a(n) = A047980(2n).at n=24A047981
- a(n)=T(n,n), array T as in A049735.at n=32A049740
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 7.at n=14A051972
- a(n) = binomial(2*n-5,n-2) + 2.at n=10A052473
- Square table read by antidiagonals which forms a permutation of the natural numbers: T(n,0) = floor(n*x/(x-1))+1, T(n,k+1) = ceiling(x*T(n,k)), for n>=0, k>=0, where x = 1 + sqrt(2).at n=56A083087
- Values of k such that floor(k*tanh(Pi)) = floor((k+1) tanh(Pi)).at n=23A096613
- a(n) = (1/2) * (5*P(n+1) + P(n) - 1), where P(k) are the Pell numbers A000129.at n=9A098586
- Least multiple of prime(n) ending in digits of n.at n=33A114012
- G.f.: 1/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)*(1-x^5))^2.at n=18A117487
- Numbers n such that n^3 is zeroless pandigital.at n=26A124628
- Numbers k such that the continued fraction of (1 + sqrt(k))/2 has period 7.at n=40A146332
- Positive numbers y such that y^2 is of the form x^2+(x+73)^2 with integer x.at n=9A160041
- X-toothpick sequence on Z^3 lattice (see Comments for precise definition).at n=26A160170
- Number of lines through at least 2 points of an 8 X n grid of points.at n=21A160848
- Number of compositions of n such that the smallest part is divisible by the number of parts.at n=41A171628