3849
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
- 5136
- Proper Divisor Sum (Aliquot Sum)
- 1287
- 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
- 2564
- Möbius Function
- 1
- Radical
- 3849
- 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
- 131
- 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
- Multilevel sieve: at k-th step, accept k numbers, reject k, accept k, ...at n=9A005209
- Coordination sequence T1 for Zeolite Code -PAR.at n=44A009855
- Prefix (or Levenshtein) codes for natural numbers.at n=25A010097
- Number of ordered quadruples of integers from [ 1,n ] with no common factors between pairs.at n=29A015636
- Expansion of 1/(1-x^3-x^4-x^5-x^6).at n=30A017819
- Numbers k such that the continued fraction for sqrt(k) has period 64.at n=12A020403
- Numbers having period-1 5-digitized sequences.at n=38A031187
- 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 40.at n=25A031538
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 30 ones.at n=22A031798
- Lucky numbers with size of gaps equal to 16 (lower terms).at n=13A031898
- Coordination sequence T4 for Zeolite Code STT.at n=41A038417
- Starting positions of strings of 2 0's in the decimal expansion of Pi.at n=26A050201
- Integer part of log(n)^sqrt(n).at n=39A062463
- Nearest integer to log(n)^sqrt(n).at n=39A062464
- Interprimes which are of the form s*prime, s=3.at n=46A075278
- Triangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, 1, 1, 1, ...] DELTA [1, 0, 2, 0, 2, 0, 3, 0, 2, 0, 4, 0, 2, 0, ...] (A000005 interspersed with 0's) where DELTA is Deléham's operator defined in A084938.at n=32A085853
- Expansion (1+x^3)/(1-x-x^7).at n=38A098527
- Positions of the increasingly larger partial quotients in A107952.at n=12A106643
- Records in A111229.at n=25A111270
- a(1) = 4; a(n) is smallest semiprime > 3*a(n-1).at n=6A117916