6207
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8280
- Proper Divisor Sum (Aliquot Sum)
- 2073
- 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
- 4136
- Möbius Function
- 1
- Radical
- 6207
- 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
- 93
- 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
- a(n) = floor(exp(5/24)*n!).at n=6A030805
- 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 25.at n=29A031523
- Bessel function |J_0(n)| is a monotonically decreasing positive sequence.at n=32A046962
- Numbers that reach the fixed point 89 under iteration of f(x) = reverse(x) - maxdigit(x).at n=6A097155
- Row sums of A103691.at n=18A103692
- Matrix cube of triangle A104980.at n=23A104990
- Conjectured numbers n such that the trajectory of n as defined in A003508 is unique.at n=26A105233
- Triangle of numbers related to the generalized Catalan sequence C(2;n+1)=A064062(n+1), n>=0.at n=31A113647
- Fifth diagonal (M=5) sequence of triangle A113647, called Y(2,1).at n=3A115152
- Semiprimes s such that s-/+4 are primes.at n=38A125216
- a(n) = a(n-1) + a(floor(n/2)) + a(ceiling(n/2)).at n=26A131205
- Number of binary words of length n containing at least one subword 10^{6}1 and no subwords 10^{i}1 with i<6.at n=39A143286
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (0, 0, 1), (0, 1, -1), (1, 0, 1)}.at n=7A150402
- Where records occur in A001917.at n=13A152597
- Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 4 X 4 X 4 subtriangle summing to 10.at n=9A154078
- G.f.: A(x) = exp( Sum_{n>=1} 3*A038500(n) * x^n/n ), where A038500 is the highest power of 3 dividing n.at n=26A161809
- Numbers k such that 6*k + 7 = p^2 (p=prime).at n=41A171140
- Partial sums of A002503.at n=32A176358
- Number of (n+1) X 5 0..2 arrays with every 2 x 2 subblock summing to 4.at n=5A183627
- Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock summing to 4.at n=3A183629