3809
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4116
- Proper Divisor Sum (Aliquot Sum)
- 307
- 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
- 3504
- Möbius Function
- 1
- Radical
- 3809
- 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
- 175
- 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 permutations according to distance.at n=11A002525
- Numbers k such that 4!*(2k-5)!/(k!*(k-1)!) is an integer.at n=39A004784
- Numbers k such that the continued fraction for sqrt(k) has period 39.at n=2A020378
- a(n) = least m such that if r and s in {1/1, 1/2, 1/3, ..., 1/n} satisfy r < s, then r < k/m < (k+4)/m < s for some integer k.at n=28A024846
- "EFK" (unordered, size, unlabeled) transform of 2,1,1,1,...at n=47A032303
- Numbers each of whose runs of digits in base 12 has length 2.at n=26A033010
- Numbers whose base-12 expansion has no run of digits with length < 2.at n=39A033025
- Coordination sequence T3 for Zeolite Code SFF.at n=41A038433
- Denominators of continued fraction convergents to sqrt(63).at n=6A041111
- Numerators of continued fraction convergents to sqrt(808).at n=7A042558
- Numbers k such that the string 0,9 occurs in the base 10 representation of k but not of k-1.at n=40A044341
- Positive integers having more base-12 runs of even length than odd.at n=28A044838
- Starting positions of strings of 2 4's in the decimal expansion of Pi.at n=36A050230
- Triangle read by rows: T(n,k) = number of noncommutative symmetric polynomials of degree n that have exactly k different variables appearing in each monomial and which generate the algebra of all noncommutative symmetric polynomials (n >= 1, 1 <= k <= n).at n=39A055105
- Triangle T(n,k) giving number of symmetric polynomials of degree n in k noncommuting variables, n >=2, 2 <= k <= n.at n=30A055106
- Triangle T(k,n) giving number of symmetric polynomials of degree n in k noncommuting variables, n >=2, 2 <= k <= n.at n=33A055107
- Local ranks of terms of A057122.at n=32A057124
- McKay-Thompson series of class 30F for Monster.at n=28A058617
- Engel expansion of Sum_{k>=0} 1/(6 + k)^k.at n=10A063189
- Semiprimes p1*p2 such that p2>p1 and p2 mod p1 = 7.at n=18A064905