3665
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4404
- Proper Divisor Sum (Aliquot Sum)
- 739
- 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
- 2928
- Möbius Function
- 1
- Radical
- 3665
- 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
- 43
- 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
- Coordination sequence T3 for Zeolite Code VNI.at n=37A009909
- Nine iterations of Reverse and Add are needed to reach a palindrome.at n=18A015990
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite NES = NU-87 H4[Al4Si64O136].nH2O starting with a T4 atom.at n=11A019205
- Numbers k such that the continued fraction for sqrt(k) has period 31.at n=14A020370
- Multiplicity of highest weight (or singular) vectors associated with character chi_46 of Monster module.at n=34A034434
- Coordination sequence T3 for Zeolite Code AFN.at n=43A038401
- Coordination sequence T5 for Zeolite Code DON.at n=41A047957
- Coordination sequence T3 for Zeolite Code SFE.at n=40A057319
- Numbers n such that 1n1, 3n3, 7n7 and 9n9 are all primes.at n=7A059677
- Numbers which need nine 'Reverse and Add' steps to reach a palindrome.at n=18A065214
- Numbers k such that sigma(phi(sigma(k))) = phi(sigma(phi(k))).at n=11A067160
- Numbers n such that phi(n-1) + phi(n+1) = phi(2n).at n=6A067701
- Rounded total surface area of a regular tetrahedron with edge length n.at n=46A070169
- a(n) = Sum_{k=1..n} Sum_{d=1..k} (k mod d).at n=40A072481
- Odd interprimes not divisible by 3.at n=39A072573
- Interprimes which are of the form s*prime, s=5.at n=9A075280
- Numbers k such that 5*6^k - 1 is prime.at n=18A079906
- Cubes arising in A082536.at n=7A082537
- Convolution of A000203 with partition function (A000041) of positive integers.at n=14A086732
- Composite de Polignac numbers (A006285).at n=36A098237