16205
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 22272
- Proper Divisor Sum (Aliquot Sum)
- 6067
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11088
- Möbius Function
- -1
- Radical
- 16205
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 159
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Pisot sequence E(4,10).at n=9A020709
- Numbers k in which the digits of k^2 appear.at n=26A029774
- Denominators of continued fraction convergents to sqrt(175).at n=7A041323
- Number of ways to partition {1,...,n} into arithmetic progressions of length >= 1.at n=10A053732
- Number of asymmetric mobiles (circular rooted trees) with n nodes and 5 leaves.at n=9A055366
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 1, -1), (0, 0, -1), (1, 0, 1)}.at n=9A149116
- 1/3 of the number of permutations of 2 indistinguishable copies of 1..n with exactly 3 local maxima.at n=4A152495
- a(n) = n^2 + a(n-1), with a(1)=0.at n=35A168559
- The Wiener index of the graph obtained by applying Mycielski's construction to the crown graph G(n) (n>=3).at n=32A228598
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 929", based on the 5-celled von Neumann neighborhood.at n=22A273781
- Sum of squares of numbers less than n that do not divide n.at n=36A276984
- Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 5 king-move adjacent elements, with upper left element zero.at n=7A303967
- Sum of the areas of all r X s rectangles such that r + s = 2n, with r, s composite.at n=32A334229
- Number of ways to write n as an ordered sum of 7 primes (counting 1 as a prime).at n=21A341986
- Squarefree composite numbers m such that k - m^2 < m, where k is the smallest number greater than m^2 such that rad(k) | m.at n=25A362003