4671
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 6960
- Proper Divisor Sum (Aliquot Sum)
- 2289
- 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
- 3096
- Möbius Function
- 0
- Radical
- 519
- Omega Function (Ω)
- 4
- 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
- 90
- 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
- Numerators of logarithmic numbers (also of Gregory coefficients G(n)).at n=11A002206
- a(n) = n^2 written backwards.at n=41A002942
- a(n) = (d(n)-r(n))/5, where d = A026063 and r is the periodic sequence with fundamental period (1,4,0,0,0).at n=41A026065
- a(n) = Sum_{k=m..n} T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027948.at n=21A027959
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 13 ones.at n=8A031781
- Numbers whose set of base-6 digits is {3,4}.at n=32A032830
- Numbers having four 3's in base 6.at n=17A043384
- Number of rooted trees with a forbidden limb of length 6.at n=11A052329
- Row sums of partition triangle A026820.at n=17A058397
- n^2 read backwards, for n = 51, 50, 49, ..., 1.at n=9A080334
- a(n) = (4*(n+15)^n + n^n)/5.at n=3A083306
- Arrange n^2 octagons that each have area 7 so that they leave (n-1)^2 square gaps each with area 2; a(n) is the total area of these polygons.at n=22A086640
- Numbers n such that A007306(n) divides n.at n=48A091765
- {Sum of all k-digit numbers > n }-{sum of all k-digit numbers < n}, n is a 'k'digit number.at n=17A109644
- Expansion of 1/(1 - x - x^3 + x^5).at n=40A123552
- a(n) is the number of binary strings of length n such that there exist 4 or more ones in a subsequence of length 5 or less.at n=12A130902
- Terms in A136112 which are not in A135768.at n=40A135771
- First differences of A006128.at n=25A138137
- a(1)=2. For n >=2, a(n) = p(n) *(floor(a(n-1)/p(n)) +2), where p(n) is the n-th prime.at n=39A138621
- A sequence of asymptotic density zeta(7) - 1, where zeta is the Riemann zeta function.at n=38A143033