16660
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 36
- Divisor Sum
- 43092
- Proper Divisor Sum (Aliquot Sum)
- 26432
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5376
- Möbius Function
- 0
- Radical
- 1190
- Omega Function (Ω)
- 6
- Little Omega Function (ω)
- 4
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
- no
- Narcissistic Number
- no
- Collatz Steps
- 128
- 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 whose set of base-16 digits is {1,4}.at n=23A032828
- Sums of 4 distinct powers of 4.at n=41A038472
- Numbers whose base-4 representation contains exactly four 0's and four 1's.at n=6A045037
- a(n) in base 13 is a repdigit.at n=43A048337
- Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion.at n=25A051003
- (Terms in A028273)/2.at n=35A051298
- Number of permutations with certain forbidden subsequences.at n=10A054394
- Numbers k such that k | sigma_3(k) - phi(k)^3.at n=18A055697
- Basis for code in A075928.at n=9A075929
- a(n) = floor(C(n+6,6)/C(n+2,2)).at n=45A084626
- Number of directed Hamiltonian paths on the n-antiprism graph.at n=4A124352
- Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+833)^2 = y^2.at n=30A129010
- Number of cycles for vectors of length n under the Ducci map.at n=20A135547
- 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, -1, 1), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.at n=10A148194
- Numbers in A152022 which are not products of terms of A152021.at n=38A152023
- 7 times pentagonal numbers: a(n) = 7*n*(3*n-1)/2.at n=40A152744
- Number of zig-zag paths from top to bottom of an n X n square whose color is not that of the top right corner.at n=12A153335
- Number of zig-zag paths from top to bottom of a 2n-1 by 2n-1 square whose color is not that of the top right corner.at n=6A153338
- Number of ways to place 2 nonattacking bishops on an n X n toroidal board.at n=13A177755
- Numbers that are 4-digit palindromes in at least 2 bases.at n=20A180453