3881
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
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 3882
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 3880
- Möbius Function
- -1
- Radical
- 3881
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 538
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Prime(n)*...*a(n) is the least product of consecutive primes which is non-deficient.at n=16A007686
- Prime(n)*...*a(n) is the least product of consecutive primes which is abundant.at n=16A007708
- Coordination sequence T2 for Zeolite Code AFT.at n=47A008027
- Coordination sequence T1 for Zeolite Code GIS.at n=46A008266
- n is equal to the number of 2's in all numbers <= n written in base 6.at n=3A014891
- Numbers k such that the continued fraction for sqrt(k) has period 49.at n=6A020388
- Numbers k such that k^2+k+9 is a palindrome.at n=20A027726
- Sums of 5 distinct powers of 5.at n=3A038477
- Numbers k such that 80*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=16A056694
- Coordination sequence T3 for Zeolite Code SFE.at n=41A057319
- Primes p such that x^5 == 2 (mod p) has five solutions.at n=26A059858
- Positions where number of periodic partitions increases.at n=29A059994
- a(n) = n-th prime prime(n) subtracted from sum of all composites between prime(n) and prime(n-1).at n=65A060325
- Primes with 13 as smallest positive primitive root.at n=8A061326
- Primes p such that p+7 == 0 (mod phi(p+7)).at n=22A067606
- Primes with either no internal digits or all internal digits are 8.at n=40A069683
- a(0) = 1; for n > 1, a(n) = smallest number > a(n-1) such that a(n) + a(k) is squarefree for k = 1 to n-1.at n=48A077224
- Primes which can be expressed as sum of distinct powers of 5.at n=7A077719
- Primes in A058633.at n=20A080822
- First column of square array A082011.at n=31A082013