3247
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3456
- Proper Divisor Sum (Aliquot Sum)
- 209
- 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
- 3040
- Möbius Function
- 1
- Radical
- 3247
- 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
- 48
- 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
- Let y=f(x) satisfy F(x,y)=0. a(n) is the number of terms in the expansion of (d/dx)^n y in terms of the partial derivatives of F.at n=9A003262
- Maxima of the rows of the triangle A259095.at n=35A005577
- Coordination sequence T1 for Zeolite Code AFT.at n=43A008026
- Coordination sequence T2 for Zeolite Code AFX.at n=43A009865
- Coordination sequence T2 for Zeolite Code CGS.at n=42A027366
- 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 55.at n=19A031553
- Coordination sequence for Zeolite Code DFT.at n=39A038408
- Numbers n such that string 4,7 occurs in the base 10 representation of n but not of n-1.at n=35A044379
- Numbers n such that string 4,7 occurs in the base 10 representation of n but not of n+1.at n=35A044760
- Odd numbers not of the form 3 + twin prime + twin prime.at n=31A051345
- The first k digits of k! form a prime number.at n=4A060323
- a(n) = 10*n^2 + 7.at n=18A061722
- Numbers n such that phi(phi(n)) = phi(sigma(n)) where phi is Euler's totient and sigma is the multiplicative sum-of-divisors function.at n=31A065555
- Number of elements of order 2 in GL(2,Z_n).at n=40A066947
- Numbers n such that phi(2n+1) = sigma(n).at n=25A067229
- Numbers k such that sigma(k) = phi(k*bigomega(k)+1).at n=27A067876
- Numbers k such that sigma(k) = phi(k*omega(k)+1).at n=27A067879
- a(n) = 4*n^2 + 4*n - 1.at n=27A073577
- Sum of first n 5-almost primes.at n=18A086047
- Number of Motzkin paths of length n with no level steps at even level.at n=13A090345