4839
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6456
- Proper Divisor Sum (Aliquot Sum)
- 1617
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3224
- Möbius Function
- 1
- Radical
- 4839
- 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
- 165
- 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
- Number of pairs of consecutive integers x, x+1 such that all prime factors of both x and x+1 are at most the n-th prime.at n=19A002071
- Numbers k such that k*10^k + 1 is prime.at n=6A007647
- Coordination sequence T2 for Zeolite Code RUT.at n=46A009898
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence).at n=22A024686
- a(n) = T(n,n+2), T given by A027052.at n=12A027053
- 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 23.at n=22A031521
- Position of the incrementally largest term in continued fraction for Champernowne constant (A030167).at n=9A038705
- Numbers having three 6's in base 9.at n=11A043479
- Squarefree nonprimes with property that the concatenation of the prime factors is a palindrome.at n=39A046448
- Semiprimes whose prime factors, when concatenated, yield a palindrome.at n=36A046451
- G.f.: (1 + Sum_{ i >= 0 } 2^i*x^(2^(i+1)-1)) / (1-x)^3.at n=32A063916
- Number of decimal digits in A001042.at n=16A064236
- a(n) = A077704(n+1)/A077704(n).at n=10A077705
- Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={-1}.at n=13A080011
- Positive numbers k such that the number of primes between k and 2*k is different from the number of primes between m and 2*m for every number m != k.at n=31A084142
- Duplicate of A007647.at n=6A098980
- The sum of the first n primes, minus n.at n=48A101301
- Indices of prime NSW numbers A088165.at n=16A113501
- n+sigma(n)+sigma(sigma(n)) is a triangular number.at n=26A116015
- Numbers n such that F(2*n - 1) is prime, where F(m) is a Fibonacci number.at n=24A117595