3865
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4644
- Proper Divisor Sum (Aliquot Sum)
- 779
- 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
- 3088
- Möbius Function
- 1
- Radical
- 3865
- 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
- 144
- Smith Number
- yes
- 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
- Genus of modular group Gamma(n) = genus of modular curve Chi(n).at n=50A001767
- Expansion of e.g.f. exp(x * cosh(x)).at n=8A003727
- Coordination sequence T1 for Zeolite Code FER.at n=38A008106
- Crystal ball sequence for planar net 3.6.3.6.at n=41A008580
- Expansion of e.g.f.: cos(x*cos(x)) (even powers only).at n=4A009015
- Coordination sequence T4 for Zeolite Code RTH.at n=43A009896
- a(n) = floor(n(n-1)(n-2)(n-3)/19).at n=18A011929
- Coordination sequence T1 for Zeolite Code TER.at n=42A016433
- Numbers k such that the continued fraction for sqrt(k) has period 47.at n=5A020386
- Lucky numbers with size of gaps equal to 16 (upper terms).at n=13A031899
- Numbers k such that s(k) + s(k+1) + ... + s(k+7) = t(k) + t(k+1) + ... + t(k+7).at n=7A033914
- Digit sum of 'odd' number equals digit sum of 'sum' and 'juxtaposition' of its prime factors (counted with multiplicity).at n=26A036927
- Smallest of three consecutive squarefree numbers k, k+1, k+2 of the form p*q where p and q are distinct primes.at n=39A039833
- Numbers n such that n through n+4 are divisible by the same number of distinct primes.at n=40A045933
- Numbers n such that prime(n) - sigma(n) - phi(n) = prime(n+1) - sigma(n+1) - phi(n+1), where sigma(n) = sum of divisors of n.at n=38A048783
- Number of starting positions of Nim with 2n pieces such that 2nd player wins. Partitions of 2n such that xor-sum of partitions is 0.at n=20A048833
- Larger of Smith brothers.at n=2A050220
- Number of asymmetric trees with a forbidden limb of length 3.at n=22A052326
- Numbers k such that k, k+1 and k+2 are products of two primes.at n=41A056809
- McKay-Thompson series of class 46C for the Monster group.at n=46A058689