16802
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 26112
- Proper Divisor Sum (Aliquot Sum)
- 9310
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8100
- Möbius Function
- -1
- Radical
- 16802
- 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
- 66
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence for hexagonal close-packing.at n=40A007899
- Coordination sequence for alpha-Nd, Position Nd1.at n=40A009948
- a(0) = 1, a(n) = 42*n^2 + 2 for n>0.at n=20A010023
- a(n) = b(n) - c(n) where b(n) = [ (3/2)^n ] and c(n) is the n-th number not in sequence b.at n=23A014250
- a(n) = 7^n - n.at n=5A024076
- a(n) = (d(n)-r(n))/2, where d = A026037 and r is the periodic sequence with fundamental period (1,0,0,1).at n=44A026038
- Numbers whose base-7 representation contains exactly four 6's.at n=26A043420
- a(n) = (n^3 + 4*n^2 - n)/2.at n=30A162260
- Monotonic ordering of nonnegative differences 7^i-5^j, for 40>= i>=0, j>=0.at n=20A192196
- Total number of parts >= 3 in all partitions of n.at n=28A207033
- Number of n X 2 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or vertically, with no adjacent values equal.at n=11A232059
- a(n) = n^3/3 - 7*n/3 + 4.at n=37A270809
- Sum of quadratic residues of (n-th prime == 3 mod 4).at n=30A282035
- Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p.at n=15A282041
- Partial sums of A087207.at n=43A288566
- Numbers k such that the largest prime divisor of k^4+1 is less than k.at n=19A309562
- Number of length-n binary strings having minimum string attractor size 2.at n=19A339668