15676
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 27440
- Proper Divisor Sum (Aliquot Sum)
- 11764
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7836
- Möbius Function
- 0
- Radical
- 7838
- Omega Function (Ω)
- 3
- 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
- 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
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 72 ones.at n=22A031840
- Trajectory of 1 under map n->11n+1 if n odd, n->n/2 if n even.at n=13A033963
- Trajectory of 3 under map n->11n+1 if n odd, n->n/2 if n even.at n=10A037103
- Numerators of continued fraction convergents to sqrt(865).at n=8A042670
- Numerator of Sum_{k=1..n} 1/A077800(k), denominator=A074043.at n=5A074042
- Row sums of triangle A135858.at n=25A135859
- Sums of least knight's moves from (0,0) to points in the square lattice [-n,n]x[-n,n].at n=21A183047
- Number of (n+1) X (1+1) 0..1 arrays colored with the sum of the upper and lower median values of each 2 X 2 subblock.at n=10A236323
- Number of length 4 1..(n+2) arrays with no leading or trailing partial sum equal to a prime.at n=17A254207
- Number of binary strings w of length n for which s, the longest proper suffix of w that appears at least twice in w, is of length 2.at n=16A284125
- a(n) is the number of ways to partition a square n X n into five rectangles of different dimensions, without any straight cut spanning the entire square.at n=23A384208