9905 (number)
9,905 (nine thousand nine hundred five) is an odd fourdigits composite number following 9904 and preceding 9906. In scientific notation, it is written as 9.905 × 10^{3}. The sum of its digits is 23. It has a total of 3 prime factors and 8 positive divisors. There are 6,768 positive integers (up to 9905) that are relatively prime to 9905.
Basic properties
 Is Prime? No
 Number parity Odd
 Number length 4
 Sum of Digits 23
 Digital Root 5
Name
Short name  9 thousand 905 

Full name  nine thousand nine hundred five 
Notation
Scientific notation  9.905 × 10^{3} 

Engineering notation  9.905 × 10^{3} 
Prime Factorization of 9905
Prime Factorization 5 × 7 × 283
Composite numberω(n)  Distinct Factors  3  Total number of distinct prime factors 

Ω(n)  Total Factors  3  Total number of prime factors 
rad(n)  Radical  9905  Product of the distinct prime numbers 
λ(n)  Liouville Lambda  1  Returns the parity of Ω(n), such that λ(n) = (1)^{Ω(n)} 
μ(n)  Mobius Mu  1  Returns:

Λ(n)  Mangoldt function  0  Returns log(p) if n is a power p^{k} of any prime p (for any k >= 1), else returns 0 
The prime factorization of 9,905 is 5 × 7 × 283. Since it has a total of 3 prime factors, 9,905 is a composite number.
Divisors of 9905
8 divisors
τ(n)  Total Divisors  8  Total number of the positive divisors of n 

σ(n)  Sum of Divisors  13632  Sum of all the positive divisors of n 
s(n)  Aliquot Sum  3727  Sum of the proper positive divisors of n 
A(n)  Arithmetic Mean  1704  Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n)) 
G(n)  Geometric Mean  99.523866484376  Returns the nth root of the product of n divisors 
H(n)  Harmonic Mean  5.81279342723  Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors 
The number 9,905 can be divided by 8 positive divisors (out of which 0 are even, and 8 are odd). The sum of these divisors (counting 9,905) is 13,632, the average is 1,704.
Other Arithmetic Functions (n = 9905)
φ(n)  Euler Totient  6768  Total number of positive integers not greater than n that are coprime to n 

λ(n)  Carmichael Lambda  564  Smallest positive number such that a^{λ(n)} ≡ 1 (mod n) for all a coprime to n 
π(n)  Prime Pi  ≈ 1220  Total number of primes less than or equal to n 
r_{2}(n)  Sum of 2 squares  0  The number of ways n can be represented as the sum of 2 squares 
There are 6,768 positive integers (less than 9,905) that are coprime with 9,905. And there are approximately 1,220 prime numbers less than or equal to 9,905.
Divisibility of 9905
m  2  3  4  5  6  7  8  9 

n mod m  1  2  1  0  5  0  1  5 
The number 9,905 is divisible by 5 and 7.
Classification of 9905
By Arithmetic functions
 Arithmetic
 Deficient
Expressible via specific sums
 Polite
By Powers
 Square Free
Other numbers
 LucasCarmichael
 Sphenic
Base conversion (9905)
Base  System  Value 

2  Binary  10011010110001 
3  Ternary  111120212 
4  Quaternary  2122301 
5  Quinary  304110 
6  Senary  113505 
8  Octal  23261 
10  Decimal  9905 
12  Duodecimal  5895 
16  Hexadecimal  26b1 
20  Vigesimal  14f5 
36  Base36  7n5 
Basic calculations (n = 9905)
Multiplication
n×yn×2  19810 

n×3  29715 
n×4  39620 
n×5  49525 
Division
n÷yn÷2  4952.500 

n÷3  3301.666 
n÷4  2476.250 
n÷5  1981.000 
Exponentiation
n^{y}n^{2}  98109025 

n^{3}  971769892625 
n^{4}  9625380786450625 
n^{5}  95339396689793440625 
Nth Root
^{y}√n^{2}√n  99.523866484376 

^{3}√n  21.475905945718 
^{4}√n  9.9761649186637 
^{5}√n  6.297539438733 
9905 as geometric shapes
Circle
Radius = nDiameter  19810 

Circumference  62234.950467614 
Area  308218592.19086 
Sphere
Radius = nVolume  4070540207533.9 

Surface area  1232874368.7634 
Circumference  62234.950467614 
Square
Length = nPerimeter  39620 

Area  98109025 
Diagonal  14007.785335306 
Cube
Length = nSurface area  588654150 

Volume  971769892625 
Space diagonal  17155.96324897 
Equilateral Triangle
Length = nPerimeter  29715 

Area  42482453.995261 
Altitude  8577.9816244849 
Triangular Pyramid
Length = nSurface area  169929815.98105 

Volume  114524180138.01 
Height  8087.3986340891 
Cryptographic Hash Functions
md5  36ae77db7915835abc105f631f0391f8 

sha1  2b011e0c2c826a44168e0337c74573a129dc90e7 
sha256  f34faff80b330ad8e52cb94a75498e84bf408f25fe3e763a758b5bce4649c4d5 
sha512  b4dfd2b6be5265d07bb3512bbd64991757dcb9633eea8685ad8f3ebc5f5b944709fac19a6fff7548dcfa051bb967014d4672a8b41e9adf85b2aa0e03d0f06eb7 
ripemd160  09b8fbe048cb4b9aea080ca1fad1ee654c3cf625 