3811
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3952
- Proper Divisor Sum (Aliquot Sum)
- 141
- 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
- 3672
- Möbius Function
- 1
- Radical
- 3811
- 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
- 38
- 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
- Shifts left when inverse Moebius transform applied twice.at n=35A007557
- Coordination sequence T1 for Zeolite Code STI.at n=42A008234
- a(n) = floor( n*(n-1)*(n-2)/29 ).at n=49A011911
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly three 1's.at n=43A013650
- Pseudoprimes to base 47.at n=36A020175
- Smaller of a pair of consecutive lucky numbers with a gap of 2n.at n=15A031884
- Lucky numbers with size of gaps equal to 16 (upper terms).at n=12A031899
- Floor( 7*n^2/2 ).at n=33A032525
- Number of flat partitions of n: partitions {a_i} with each |a_i - a_{i-1}| <= 1.at n=49A034296
- Multiplicity of highest weight (or singular) vectors associated with character chi_57 of Monster module.at n=35A034445
- Number of n-celled solid polyominoes (or free polycubes, allowing mirror-image identification).at n=7A038119
- Coordination sequence T5 for Zeolite Code SFF.at n=41A038436
- T(n,1..i) are attractors in '3x+(2n+1)' problem.at n=53A039512
- Denominators of continued fraction convergents to sqrt(496).at n=11A041947
- Numbers n such that string 1,1 occurs in the base 10 representation of n but not of n-1.at n=38A044343
- Numbers n such that string 1,1 occurs in the base 10 representation of n but not of n+1.at n=38A044724
- Numbers whose base-5 representation contains exactly three 1's and two 2's.at n=18A045231
- Positions of 4-digit terms in the continued fraction for Pi (3 is at position 0).at n=2A048959
- Number of asymmetric mobiles (circular rooted trees) with n nodes and 3 leaves.at n=18A055364
- Indices of primes in sequence defined by A(0) = 77, A(n) = 10*A(n-1) - 13 for n > 0.at n=11A056259