3817
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4176
- Proper Divisor Sum (Aliquot Sum)
- 359
- 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
- 3460
- Möbius Function
- 1
- Radical
- 3817
- 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
- 82
- 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
- Expansion of e.g.f. cos(tan(x)/cosh(x)), even terms only.at n=4A009082
- E.g.f.: exp(tanh(x)/cos(x)).at n=8A009274
- Coordination sequence T3 for Zeolite Code VNI.at n=38A009909
- Coordination sequence T3 for Zeolite Code TER.at n=41A016435
- Numbers k such that the continued fraction for sqrt(k) has period 80.at n=8A020419
- Number of terms in 6th derivative of a function composed with itself n times.at n=9A022816
- Number of terms in n-th derivative of a function composed with itself 10 times.at n=6A024210
- Coordination sequence T5 for Zeolite Code MWW.at n=41A024990
- a(n) = [ 3rd elementary symmetric function of {log(k)} ], k = 2,3,...,n.at n=12A025203
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 40 ones.at n=12A031808
- Numbers whose base-3 representation Sum_{i=0..m} d(i)*3^i has d(m) < d(m-1) > d(m-2) < ...at n=39A032841
- Expansion of 1/(1-x)^2/(1-x^2)/(1-x^3)/(1-x^5)/(1-x^8).at n=31A034379
- Number of near-rings (or nearrings) definable on cyclic group of order n.at n=13A037221
- Number of primes < n^3.at n=32A038098
- Coordination sequence T2 for Zeolite Code ESV.at n=41A038410
- Conjecturally, largest attractor in '3x+(2n+1)' problem.at n=27A039515
- Sizes of successive balls in D_4 lattice.at n=19A046949
- a(n)=T(2n-1,n), array T given by A048212.at n=32A048221
- Matrix 10th power of partition triangle A008284.at n=15A050304
- First spoke of a hexagonal spiral.at n=36A056105