3919
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
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 3920
- 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
- 3918
- Möbius Function
- -1
- Radical
- 3919
- 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
- 82
- 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
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 543
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Supersingular primes of the elliptic curve X_0 (11).at n=11A006962
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MEL = ZSM-11 Nan[AlnSi96-nO192] starting with a T6 atom.at n=11A019154
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite VET = VPI-8 [Si17O34] starting with a T2 atom.at n=11A019248
- Let q_k = p*(p+2) be product of k-th pair of twin primes; sequence gives values of p+2 such that (q_k)^2 > q_{k-i}*q_{k+i} for all 1 <= i <= k-1.at n=33A021007
- Place where n-th 1 occurs in A023125.at n=32A022787
- Primes that remain prime through 2 iterations of function f(x) = 5x + 2.at n=44A023252
- Primes that remain prime through 3 iterations of function f(x) = 9x + 10.at n=20A023299
- Primes that remain prime through 3 iterations of function f(x) = 10x + 9.at n=20A023301
- Primes that remain prime through 4 iterations of function f(x) = 9x + 10.at n=7A023327
- Number of distinct products ijk with 1 <= i,j,k <= n.at n=39A027425
- Sums of six consecutive squares: a(n) = n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 + (n+5)^2.at n=23A027865
- Primes of the form n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 + (n+5)^2.at n=9A027867
- Palindromic primes in base 16 (or hexadecimal), but written here in base 10.at n=40A029732
- 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=17A031559
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 56 ones.at n=1A031824
- Trajectory of 1 under map n->11n+1 if n odd, n->n/2 if n even.at n=15A033963
- Trajectory of 3 under map n->11n+1 if n odd, n->n/2 if n even.at n=12A037103
- Numbers m such that string 9,1 occurs in the base 10 representation of m but not of m+1.at n=42A044804
- Numbers whose base-4 representation contains exactly one 0 and four 3's.at n=36A045070
- Primes p such that p+4 and p+12 are also prime.at n=33A046137