3669
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
- 4896
- Proper Divisor Sum (Aliquot Sum)
- 1227
- 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
- 2444
- Möbius Function
- 1
- Radical
- 3669
- 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
- 38
- 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
- a(n) = Fibonacci(n+1) - 2^floor(n/2).at n=18A005672
- Coordination sequence T1 for Zeolite Code DDR.at n=38A008071
- Coordination sequence T2 for Zeolite Code -CHI.at n=38A009847
- Powers of fifth root of 13 rounded down.at n=16A018150
- Expansion of 1/((1-4x)(1-8x)(1-9x)).at n=3A019664
- Numbers k such that the continued fraction for sqrt(k) has period 72.at n=4A020411
- a(n) = Fibonacci(n) - 2^(floor(n/2)).at n=19A028892
- 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=15A031538
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 32 ones.at n=16A031800
- Coordination sequence Z12 for Zeolite Code STT.at n=40A038416
- Coordination sequence T5 for Zeolite Code STF.at n=40A038440
- Numbers n such that string 6,6 occurs in the base 10 representation of n but not of n+1.at n=36A044779
- Same rule as Aitken triangle (A011971) except a(0,0)=1, a(1,0)=0.at n=40A046934
- Sequence formed from rows of triangle A046934.at n=31A046935
- a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i) where T is A049615.at n=45A049618
- a(n) = Sum_{i=0..floor((n+1)/2)} T(2i+1,n-2i-1) where T is A049615.at n=45A049619
- Nonprime numbers n such that n and n-reversed (<>n and no leading zeros) have the same number of prime factors and these prime factors (palindromes allowed here) are also reversals of each other.at n=44A050702
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=22A051965
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 98 ).at n=39A063371
- a(n) = ((6*n+19)*4^n - 1)/3.at n=4A072260