3826
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
- 5742
- Proper Divisor Sum (Aliquot Sum)
- 1916
- 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
- 1912
- Möbius Function
- 1
- Radical
- 3826
- 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
- yes
- Odd
- no
Appears in sequences
- Nonsquare values of m in the discriminant D = 4*m leading to a new maximum of the L-function of the Dirichlet series L(1) = Sum_{k>0} Kronecker(D,k)/k.at n=27A003421
- Coordination sequence T2 for Zeolite Code EAB and OFF.at n=45A008083
- Coordination sequence T2 for Zeolite Code FER.at n=38A008107
- Coordination sequence T1 for Zeolite Code LAU.at n=44A008124
- Coordination sequence T1 for Zeolite Code YUG.at n=40A008247
- Coordination sequence T6 for Zeolite Code VNI.at n=38A009912
- a(n) = floor(binomial(n,3)/3).at n=42A011849
- Numbers k such that the continued fraction for sqrt(k) has period 70.at n=7A020409
- Least m such that if r and s in {1/3, 1/6, 1/9, ..., 1/3n} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=27A024838
- 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 60.at n=19A031558
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 32 ones.at n=18A031800
- a(n) = floor( (Pi/e)^n ).at n=57A032739
- Numbers whose base-3 representation Sum_{i=0..m} d(i)*3^i has d(m) < d(m-1) > d(m-2) < ...at n=41A032841
- Internal digits of n^2 include digits of n, n does not end in 0.at n=43A046833
- Becomes prime after exactly 6 iterations of f(x) = sum of prime factors of x.at n=36A047825
- Numbers n such that prime(n) - sigma(n) - phi(n) = prime(n+1) - sigma(n+1) - phi(n+1), where sigma(n) = sum of divisors of n.at n=37A048783
- Numbers k such that 201*2^k-1 is prime.at n=34A050852
- Number of primes in the interval [prime(n), prime(n)^2].at n=42A054272
- a(n) = Sum_{k=1..n} phi(k)^2.at n=28A057434
- Numbers k such that (7*3^k - 5)/2 is prime.at n=19A059569