4119
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5496
- Proper Divisor Sum (Aliquot Sum)
- 1377
- 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
- 2744
- Möbius Function
- 1
- Radical
- 4119
- 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
- 38
- 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
- a(n) = 2*(3^n - 2^n) + 1.at n=7A002783
- Non-seed mu-atoms of period n in Mandelbrot set.at n=25A006875
- Coordination sequence T1 for Zeolite Code SGT.at n=40A008229
- Coordination sequence T1 for Zeolite Code ZON.at n=45A009919
- Zagier's function -J_1(4*n-1).at n=2A027654
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 21.at n=24A031519
- Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 3,1,0,2.at n=4A037774
- Denominators of continued fraction convergents to sqrt(542).at n=10A042037
- Numbers whose base-16 representation has exactly 4 runs.at n=6A043677
- Numbers whose base-4 representation contains exactly three 0's and three 1's.at n=11A045031
- Number of increasing arithmetic progressions in {1,2,3,...,n}, including trivial arithmetic progressions of lengths 1 and 2.at n=47A051336
- Numbers k such that k^2 contains only digits {1,6,9}.at n=9A053910
- Number of primes in the interval [prime(n), prime(n)^2].at n=45A054272
- a(n) = (1/(2n)) * Sum_{d|n} phi(d) * 2^(2n/d) + (2^((n-4)/2), if n is even).at n=5A058880
- Numbers k such that k^2 has property that the sum of its digits and the product of its digits are nonzero squares.at n=42A061268
- a(n) = 2^n + 2*n - 1.at n=12A061761
- Diagonals and antidiagonals of the prime-composite array, B(m,n) which are zeros from the Third Borve Conjecture.at n=34A067681
- Numbers n such that n and prime(n) end with the same two digits.at n=39A067838
- Numbers n such that n and prime(n) end with the same three digits.at n=2A067841
- Sum_{k=1..n} floor(n*(n-1)/(2*k)).at n=44A069627