3994
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5994
- Proper Divisor Sum (Aliquot Sum)
- 2000
- 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
- 1996
- Möbius Function
- 1
- Radical
- 3994
- 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
- 51
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) = 1 + Sum_{i=1..n} (n-i+1)*phi(i).at n=33A005598
- Number of transitive relations on n labeled nodes.at n=4A006905
- Coordination sequence T2 for Zeolite Code ERI.at n=46A008094
- Coordination sequence for tridymite, lonsdaleite, and wurtzite.at n=39A008264
- Coordination sequence T1 for Zeolite Code -CHI.at n=40A009846
- Coordination sequence for FeS2-Marcasite, S position.at n=33A009954
- Conjectured formula for irreducible 6-fold Euler sums of weight 2n+16.at n=20A019459
- Numbers k such that the continued fraction for sqrt(k) has period 67.at n=4A020406
- a(n)-th nonsquarefree is sum of first k nonsquarefrees for some k.at n=41A020644
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 28 ones.at n=30A031796
- Coordination sequence T8 for Zeolite Code SFF.at n=42A038435
- Numbers whose base-7 representation contains exactly three 4's.at n=35A043411
- Numbers whose base-5 representation contains exactly three 1's and two 4's.at n=24A045261
- Number of simple unlabeled n-node graphs of connectivity 1.at n=7A052442
- Susceptibility series H_4 for 2-dimensional Ising model (divided by 2).at n=6A055856
- Susceptibility series H_6 for 2-dimensional Ising model (divided by 2).at n=4A055857
- Numbers k such that k^10 == 1 (mod 11^3).at n=30A056085
- Integer part of the blowup factor for A025587(n).at n=10A061523
- a(n) = n*11^n + 1.at n=3A064749
- Numbers k such that 2^k + Fibonacci(k) is prime.at n=17A074824