13943
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14208
- Proper Divisor Sum (Aliquot Sum)
- 265
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13680
- Möbius Function
- 1
- Radical
- 13943
- 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
- 58
- 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
- Convolution of A023531 and Fibonacci numbers.at n=21A023557
- Convolution of A023531 and (F(2), F(3), F(4), ...).at n=20A023561
- Base-9 palindromes that start with 2.at n=30A043029
- Prefixing, suffixing or inserting a 9 in the number anywhere gives a prime.at n=44A069833
- Indices of primes in sequence defined by A(0) = 73, A(n) = 10*A(n-1) + 53 for n > 0.at n=9A101151
- Least multiple of prime(n) ending in digits of n.at n=39A114012
- Egyptian fraction representation for the cube root of 92.at n=2A132566
- Expansion of (1-x+19*x^3-3*x^4)/(1-x)^3.at n=43A195241
- (p^2 - 3)/2 for odd primes p.at n=37A243887
- Number of length n+4 0..1 arrays with at most one downstep in every 4 consecutive neighbor pairs.at n=11A255988
- Palindromic numbers in bases 3 and 9 written in base 10.at n=46A259386
- Number of GP-posets (gluing-parallel posets) with n points.at n=8A345673