4665
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 7488
- Proper Divisor Sum (Aliquot Sum)
- 2823
- 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
- 2480
- Möbius Function
- -1
- Radical
- 4665
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 134
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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 T2 for Zeolite Code EPI.at n=43A008091
- Coordination sequence T6 for Zeolite Code EUO.at n=42A008101
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite DDR = Deca-dodecasil 3R[Si120O240]qR starting with a T7 atom.at n=11A019109
- Nearest integer to Gamma(n + 1/11)/Gamma(1/11).at n=9A020014
- Ceiling of Gamma(n+1/11)/Gamma(1/11).at n=9A020104
- (d(n)-r(n))/5, where d = A008778 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=48A026053
- Expansion of 3*(1+2*x-2*x^2)/((1-x)*(1-6*x^2)).at n=8A026551
- Numbers whose set of base-6 digits is {3,4}.at n=30A032830
- Number of partitions of n into parts not of the form 15k, 15k+6 or 15k-6. Also number of partitions with at most 5 parts of size 1 and differences between parts at distance 6 are greater than 1.at n=31A035960
- Base-6 palindromes that start with 3.at n=35A043012
- Numbers that are repdigits in base 6.at n=23A048331
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 24.at n=29A051989
- a(n) = floor(6^6/n).at n=9A057068
- Numbers n such that n*10^n - 1 is prime.at n=15A059671
- a(1) = 4, a(n+1) is the smallest composite number > a(n) such that all of the differences a(n+1)-a(n) are distinct primes.at n=48A073679
- Sum of squares of digits of n is equal to the largest prime factor of n reversed, where the largest prime factor is not a palindrome.at n=9A074303
- Number of compositions of n with first part 2 and no equal adjacent parts; this is column 2 of the array in A096568.at n=18A096570
- Triangle read by rows: T(n,k) is number of Dyck paths of semilength n having k ascents of length 1 starting at an even level.at n=70A102404
- Number of distinct values of i*j + j*k + k*i with 1 <= i<= j < k <= n.at n=47A102534
- a(n) is number of solutions of the equation sigma(x)=10^n.at n=23A110078