4207
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
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4816
- Proper Divisor Sum (Aliquot Sum)
- 609
- 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
- 3600
- Möbius Function
- 1
- Radical
- 4207
- 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
- 108
- 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
- Construct a triangle as in A036262. Sequence is one less than the position of the first number larger than 2 in the n-th row (n-th difference).at n=52A000232
- Number of unlabeled trivalent (or cubic) graphs with 2n nodes.at n=8A005638
- a(0) = 1, a(n) = 5*n^2 + 2 for n>0.at n=29A010001
- Pseudoprimes to base 24.at n=22A020152
- Pseudoprimes to base 25.at n=42A020153
- Coordination sequence T7 for Zeolite Code MWW.at n=43A024992
- Numerator of Sum_{k=1..n} 1/phi(k).at n=19A028415
- Number of planted noncrossing bushes with n nodes; i.e., rooted noncrossing trees with n nodes, root degree 1 and no nonroot nodes of degree 1.at n=8A030980
- 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 63.at n=19A031561
- Lucky numbers with size of gaps equal to 20 (lower terms).at n=7A031902
- Coordination sequence T3 for Zeolite Code ESV.at n=43A038412
- Numbers whose base-8 representation has exactly 5 runs.at n=34A043627
- Numbers k such that the string 0,7 occurs in the base 10 representation of k but not of k-1.at n=45A044339
- Coordination sequence T3 for Zeolite Code MSO.at n=45A047965
- Odd numbers not of the form 3 + twin prime + twin prime.at n=34A051345
- Number of ways of numbering the faces of a cube with nonnegative integers so that the sum of the 6 numbers is n.at n=23A054473
- First position of n in continued fraction for Khinchin's constant.at n=42A054781
- Expansion of e.g.f.: -LambertW(-x/(1+x)).at n=7A060356
- Numbers k such that k*2^m-1 are composites for all exponents m in the range 0<=m<=k.at n=17A061154
- Semiprimes p1*p2 such that p2 mod p1 = 6, with p2 > p1.at n=43A064904