3871
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
- 6
- Divisor Sum
- 4560
- Proper Divisor Sum (Aliquot Sum)
- 689
- 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
- 3276
- Möbius Function
- 0
- Radical
- 553
- Omega Function (Ω)
- 3
- 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
- 113
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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 sublattices of index n in generic 3-dimensional lattice.at n=45A001001
- Centered icosahedral (or cuboctahedral) numbers, also crystal ball sequence for f.c.c. lattice.at n=10A005902
- Coordination sequence T1 for Zeolite Code AEL.at n=41A008004
- Coordination sequence T2 for Zeolite Code MAZ.at n=43A008145
- Conjectured formula for irreducible 5-fold Euler sums of weight 2n+13.at n=30A019450
- Pseudoprimes to base 80.at n=31A020208
- 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 61.at n=14A031559
- Composite numbers whose prime factors have no digits other than 7's and 9's.at n=5A036324
- Numerators of continued fraction convergents to sqrt(215).at n=7A041400
- Denominators of continued fraction convergents to sqrt(723).at n=6A042393
- Numerators of continued fraction convergents to sqrt(860).at n=3A042660
- Numbers whose base-4 representation contains exactly one 0 and four 3's.at n=30A045070
- Numbers whose base-4 representation contains exactly one 1 and four 3's.at n=36A045118
- Numbers whose base-4 representation contains no 2's and exactly four 3's.at n=37A045137
- Numbers whose base-5 representation contains exactly three 1's and two 4's.at n=18A045261
- Has both a primitive and imprimitive representation as x^2 + xy + y^2.at n=29A045897
- a(n) = 2*n^2 - 1.at n=44A056220
- Number of primitive sublattices of index n in generic 3-dimensional lattice.at n=45A060983
- Sum of divisors of square numbers.at n=45A065764
- Records in the Conway's alimentary function A070871.at n=36A070926