3959
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4104
- Proper Divisor Sum (Aliquot Sum)
- 145
- 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
- 3816
- Möbius Function
- 1
- Radical
- 3959
- 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
- 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
- Let A(n) = #{(i,j): i^2 + j^2 <= n}, V(n) = Pi*n, P(n) = A(n) - V(n); sequence gives values of n where |P(n)| sets a new record.at n=29A000099
- Number of paraffins C_n H_{2n} X Y with n carbon atoms.at n=10A000635
- The coding-theoretic function A(n,4,4).at n=43A001843
- Worst cases for Pierce expansions (denominators).at n=21A006538
- Coordination sequence T1 for Zeolite Code EPI.at n=40A008090
- Minimal number of people to give a 50% probability of having at least n coincident birthdays in one year.at n=21A014088
- Pisot sequences L(3,7) or S(3,7).at n=8A020730
- Coordination sequence T3 for Zeolite Code MWW.at n=43A024988
- (d(n)-r(n))/5, where d = A006527 and r is the periodic sequence with fundamental period (4,1,4,0,1).at n=37A026036
- a(n) = prime(n)*prime(n+1) - prime(n) - prime(n+1).at n=17A037165
- Numbers whose base-4 representation contains exactly two 1's and four 3's.at n=10A045123
- Smallest semiprime p*q such that q >= p and q mod p = n.at n=33A064910
- Number of partitions of n into distinct parts such that number of parts is even.at n=57A067661
- Solve 2^n - 2 = 7(x^2 - x) + (y^2 - y) for (x,y) with x>0, y>0; sequence gives value of x.at n=27A076632
- a(n) = index of the triangular number A076971(n).at n=22A076972
- Expansion of (1-x) / (1+x^2+2*x^3).at n=26A078033
- Non-balanced numbers in A015771.at n=7A078549
- a(n) = Sum_{i=1..n} Ulam(i), where Ulam(i) denotes the i-th Ulam number.at n=43A078663
- Number of partitions of n into distinct parts with odd number of even parts.at n=56A096792
- Indices of primes in sequence defined by A(0) = 27, A(n) = 10*A(n-1) - 23 for n > 0.at n=8A101959