4645
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5580
- Proper Divisor Sum (Aliquot Sum)
- 935
- 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
- 3712
- Möbius Function
- 1
- Radical
- 4645
- 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
- 183
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 62.at n=15A020401
- A convolution triangle of numbers obtained from A001792.at n=40A030523
- Lucky numbers with size of gaps equal to 16 (upper terms).at n=16A031899
- Numbers whose concatenation of prime factors (with multiplicity) is a square.at n=16A038693
- Becomes prime or 4 after exactly 8 iterations of f(x) = sum of prime factors of x.at n=9A048130
- a(n) = T(2n-1,n), array T given by A048201.at n=34A048208
- Numbers that in base 2 need twelve 'Reverse and Add' steps to reach a palindrome.at n=41A066133
- Numbers n such that phi(n-1) + phi(n+1) = phi(2n).at n=7A067701
- Rounded total surface area of a regular dodecahedron with edge length n.at n=15A071397
- Minimal total volume of n bricks with integer sides, all sides being different. Lowest value of sum of products of triples p*q*r chosen from [1,3n].at n=6A072368
- Indices of double-safe primes: p=prime(n) is double-safe: q=(p-1)/2 & r=(q-1)/2 are both prime (and q is safe).at n=44A075133
- Average of four successive primes squared, (prime(n)^2 + prime(n+1)^2 + prime(n+2)^2 + prime(n+3)^2)/4, n>=2.at n=16A075894
- Expansion of (1-x)/(1+x-2*x^2-x^3).at n=14A078038
- A014486-indices of binary trees whose left and right subtree are identical.at n=14A083938
- Number of isolated-pentagon fullerenes with 2n vertices (or carbon atoms).at n=25A086423
- Spiro-tribonacci numbers: a(n) = sum of three previous terms that are nearest when terms arranged in a spiral.at n=27A092360
- E.g.f.: exp(x)/(1-x)^6.at n=4A096307
- Floor of area of triangle with consecutive prime sides.at n=25A096377
- a(n) = n*(2*n^8 + 84*n^6 + 798*n^4 + 1636*n^2 + 315)/2835.at n=5A099196
- Numbers n such that 2*10^n-3 is prime.at n=15A102947