16593
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 22128
- Proper Divisor Sum (Aliquot Sum)
- 5535
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11060
- Möbius Function
- 1
- Radical
- 16593
- Omega Function (Ω)
- 2
- 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
- 40
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Numbers k such that the smoothly undulating palindromic number (32*10^k - 23)/99 is a prime.at n=8A062217
- Euler-Seidel matrix T(k,n) with start sequence A000248, read by antidiagonals.at n=29A098697
- Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.at n=14A146019
- Numbers n with property that 4 n^2 are squares arising in A158470.at n=32A158517
- Number of n-bead necklaces labeled with numbers -2..2 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.at n=8A209067
- T(n,k) = number of n-bead necklaces labeled with numbers -k..k not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.at n=53A209073
- Number of (n+3) X 10 0..2 matrices with each 4 X 4 subblock idempotent.at n=8A224727
- Expansion of -(-4*x^4 + sqrt(-4*x^2-4*x+1) * (2*x^3+x^2-2*x) -12*x^3-7*x^2+2*x) / (sqrt(-4*x^2-4*x+1) * (4*x^3+8*x^2+3*x-1) - 4*x^3-8*x^2-3*x+1).at n=8A238578
- Composite numbers whose concatenation of their aliquot parts, in ascending order, is a palindrome.at n=29A249300
- Admirable totient numbers: numbers that are equal to the sum of their iterated phi, with one of them taken with a minus sign.at n=43A335121
- Numbers k such that k, k + 1, k + 2, and k + 4 are all semiprimes.at n=48A368670