10239
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 13656
- Proper Divisor Sum (Aliquot Sum)
- 3417
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6824
- Möbius Function
- 1
- Radical
- 10239
- 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
- 241
- 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
- Woodall (or Riesel) numbers: n*2^n - 1.at n=9A003261
- a(n) = 2*a(n-2) + 1.at n=22A010737
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 33.at n=35A031531
- Lucky numbers with size of gaps equal to 16 (lower terms).at n=29A031898
- Numbers with exactly five distinct base-10 digits.at n=5A031987
- Sums of 12 distinct powers of 2.at n=13A038463
- a(n) = 5*2^(n-1) - 1, n>0, with a(0)=1.at n=12A052549
- a(n) = T(n,1), array T as in A054134.at n=12A054135
- Composite numbers k for which phi(k) + sigma(k) is an integer multiple of the 4th power of the number of divisors of k.at n=40A055468
- Number of n-digit primes with all digits distinct.at n=5A073532
- Least non-balanced x (i.e., not in A020492) such that sigma(2n-1,x)/phi(x) is an integer.at n=34A078539
- Least non-balanced x (i.e., not in A020492) such that sigma(p(n),x)/phi(x) is an integer, where p(n) = n-th prime.at n=19A078540
- a(n) = Sum_{k=0..n} binomial(n+(-1)^k, k).at n=12A087940
- Duplicate of A073532.at n=5A098225
- Odd composite numbers such that the sum of any two terms, plus 1, is composite.at n=39A133763
- a(n) = 5*2^n - 1.at n=11A153894
- a(n) = 512n - 1.at n=19A158011
- a(n) = 256*n - 1.at n=39A158250
- a(n) = 1024*n - 1.at n=9A158421
- a(n) = 10*n^2 - 1.at n=31A158447