11839
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 11840
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11838
- Möbius Function
- -1
- Radical
- 11839
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 174
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1421
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Coordination sequence for MgNi2, Position Ni3.at n=27A009934
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones.at n=1A031868
- Last member of a sexy prime quadruple: value of p+18 such that p, p+6, p+12 and p+18 are all prime.at n=24A046124
- n plus a googol is prime.at n=36A049014
- Euler transform of A002487.at n=20A071019
- Primes for which the four closest primes are smaller.at n=23A075030
- a(n) = A075443(A075451(n)).at n=24A075452
- Primes p such that q-p = 24, where q is the next prime after p.at n=17A098974
- Indices of primes in sequence defined by A(0) = 89, A(n) = 10*A(n-1) - 31 for n > 0.at n=18A101073
- Primes that do not divide any term of the Lucas 4-step sequence A073817.at n=11A106300
- Primes p such that p + googol is prime.at n=8A108250
- prime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 7.at n=27A109561
- Least prime p for which Mertens's function M(p) = n.at n=30A123172
- Primes of the form 64n+63.at n=39A127579
- Record indices of the ratio A002375(n) / n (Goldbach conjecture related).at n=43A137820
- Primes of the form 2*3*5*7*n+79.at n=27A141563
- Primes congruent to 36 mod 37.at n=38A142145
- Primes congruent to 31 mod 41.at n=38A142228
- Primes congruent to 14 mod 43.at n=30A142263
- Primes congruent to 42 mod 47.at n=27A142393