15708
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 48
- Divisor Sum
- 48384
- Proper Divisor Sum (Aliquot Sum)
- 32676
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3840
- Möbius Function
- 0
- Radical
- 7854
- Omega Function (Ω)
- 6
- Little Omega Function (ω)
- 5
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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 84
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- yes
- Odd
- no
Appears in sequences
- Tumbling distance for n-input mappings with 4 steps.at n=4A005949
- Numbers n such that 245*2^n-1 is prime.at n=15A050881
- Number of double tangents of order n.at n=14A060784
- Numbers k such that the sign of core(k)-phi(k) is not equal to 2*mu(k)^2-1, where core(k) is the squarefree part of k.at n=25A070237
- Denominator of the generalized harmonic number H(n,5,2).at n=4A075140
- Numbers k such that binomial(prime(k), k) is divisible by k^2.at n=41A081384
- Number of labeled n-vertex graphs with 2-components and without isolated vertices(1-components).at n=7A093376
- Numbers n such that primitive solutions for 1/n^2 = 1/x^2 + 1/y^2 exist.at n=37A094807
- Sixth column (m=5) of (1,4)-Pascal triangle A095666.at n=13A095668
- A Graham-Pollak-like sequence with multiplier 3 instead of 2.at n=17A100671
- Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having abscissa of first return equal to 3k.at n=24A108439
- Numbers k such that the first 9 decimal digits of the k-th Fibonacci number is 1-9 pandigital.at n=7A112516
- Invariant column vector V under matrix product A104546*V = V: a(n) = Sum_{k=0,[n/2]} A104546(n,k)*a(k).at n=7A118926
- Area common to integer-sided isosceles triangles (x,x,y) and (x,x,z=y+2d), sorted on x > z/2, d being positive.at n=33A120644
- Ratio of quadruple Sum of k^2-1 to quadruple sum of k made into an integer sequence: (1/6)*(-1 + n)*(2 + n)*(3 + n)*(7 + n).at n=14A130863
- First string of 43 consecutive composite numbers.at n=24A177949
- Numbers with prime factorization pqrst^2.at n=23A189983
- Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.at n=3A199828
- T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.at n=24A199832
- Number of -n..n arrays x(0..5) of 6 elements with zero sum and no two neighbors summing to zero.at n=3A199835