16636
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 29120
- Proper Divisor Sum (Aliquot Sum)
- 12484
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8316
- Möbius Function
- 0
- Radical
- 8318
- 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
- 53
- 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
- a(n) = prime(n)*prime(n-1) - 1.at n=31A023515
- Numbers whose base-4 representation contains exactly four 0's and three 3's.at n=18A045084
- Numbers k such that k*2^k - k - 1 is prime.at n=22A046843
- McKay-Thompson series of class 28D for Monster.at n=33A058609
- Sum over all subsets of {1,..,n} of the GCD of the subset.at n=13A065568
- a(n) = Sum_{i=1..n} i^prime(i), where prime(i) denotes i-th prime number.at n=3A135484
- Number of compositions (ordered partitions) of n where the gcd of the part sizes is not 1.at n=44A178472
- Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=6A204634
- Number of (n+2) X 9 0..3 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=6A204641
- Numbers n such that prime(n) and phi(n) have the same decimal digits.at n=36A243462
- Number of planar lattice convex polygonal lines joining the origin and the point (n,n).at n=12A267862
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 646", based on the 5-celled von Neumann neighborhood.at n=43A273328
- Number of squarefree parts in the partitions of n into 7 parts.at n=41A309459
- Numbers k such that 385*2^k+1 is prime.at n=36A322998
- Number of compositions of n where any two parts have a common divisor > 1.at n=45A337667
- Number of labeled right involutory Płonka magmas with n elements.at n=6A362821