4195
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
- 5040
- Proper Divisor Sum (Aliquot Sum)
- 845
- 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
- 3352
- Möbius Function
- 1
- Radical
- 4195
- 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
- 64
- 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 sigma(k) = sigma(k+4).at n=9A015863
- Numbers k such that the continued fraction for sqrt(k) has period 64.at n=13A020403
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 32 ones.at n=19A031800
- Coordination sequence T8 for Zeolite Code STT.at n=43A038418
- Number of planar simply-connected mono-q-polyhexes for q=3.at n=7A039627
- Number of partitions satisfying cn(0,5) + cn(1,5) <= cn(2,5) + cn(3,5) and cn(0,5) + cn(4,5) <= cn(2,5) + cn(3,5).at n=32A039886
- Numbers whose base-8 representation has exactly 5 runs.at n=24A043627
- Becomes prime after exactly 6 iterations of f(x) = sum of prime factors of x.at n=41A047825
- Numbers k such that 195*2^k-1 is prime.at n=42A050849
- Numbers n such that phi(3n+1) = sigma(n).at n=38A067233
- Number of polyiamonds with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation.at n=13A075219
- Trajectory of 290 under the Reverse and Add! operation carried out in base 4, written in base 10.at n=3A075299
- Numbers n such that sopf(n) = sopf(n-1) + sopf(n-2), where sopf(x) = sum of the distinct prime factors of x.at n=6A075565
- Column 3 of triangle A091602.at n=35A091606
- Smallest semiprime (A001358) which is at the end of an arithmetic progression of n semiprimes.at n=10A096003
- a(1) = 668; for n > 1, a(n) = a(n-1) + 1 + sum of distinct prime factors of a(n-1) that are < a(n-1).at n=19A105212
- Numbers k such that the k-th triangular number contains only digits {0,1,8}.at n=9A119046
- Numbers k such that 10*(11*10^k-1) + 3 is prime or PRP.at n=18A123383
- Divisors of 453060.at n=28A134950
- a(n) = 839*n.at n=5A135639