3867
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5160
- Proper Divisor Sum (Aliquot Sum)
- 1293
- 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
- 2576
- Möbius Function
- 1
- Radical
- 3867
- 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
- 82
- 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
- Coordination sequence T3 for Zeolite Code AEI.at n=47A008003
- Coordination sequence T2 for Zeolite Code AEL.at n=41A008005
- Coordination sequence T1 for Zeolite Code EPI.at n=39A008090
- Coordination sequence T5 for Zeolite Code MEL.at n=40A008154
- A B_2 sequence: a(n) = least value such that the sequence increases and pairwise sums of distinct terms are all distinct.at n=47A010672
- 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 61.at n=13A031559
- Coordination sequence T11 for Zeolite Code STT.at n=41A038429
- Coordination sequence T2 for Zeolite Code SFF.at n=41A038438
- Minimal elements of pairs of "Super Unitary Amicable Numbers", sorted by their minimal elements.at n=16A045613
- Discriminants of imaginary quadratic fields with class number 14 (negated).at n=40A046011
- Coordination sequence T3 for Zeolite Code MSO.at n=43A047965
- Starting index of a string of 3 or more consecutive equal digits in decimal expansion of Pi.at n=30A049515
- Starting index of a string of exactly 3 consecutive equal digits in decimal expansion of Pi.at n=24A049519
- Starting positions of strings of 2 4's in the decimal expansion of Pi.at n=40A050230
- Number of integers in the range (2^(n-1), 2^n] for which d(k)^3 > k holds, i.e., the cube of the number of divisors of k exceeds the number k.at n=25A056763
- a(1) = 5; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=38A074340
- a(n) = least odd number such that all pairwise sums a(i) + a(j), i < j <= n, are distinct.at n=36A080430
- A sequence analogous to the Lucas numbers (A000032), with ratios converging to Pi.at n=8A085422
- a(n) = sum of the first n upper twin primes.at n=22A086168
- Numbers n such that n, n-1 and n-2 have the same prime signature.at n=44A086337