7921 is an odd 4-digits composite number following 7920
and preceding 7922 . In scientific notation, it is written as 7.921 × 10^3.
The sum of its digits is 19. It has a total of 2 prime factors and 3 positive divisors.
There are 7832 positive integers (up to 7921) that are relatively prime to 7921.
7921 has 3 divisors, whose sum is 8011
The reverse of 7921 is 1297
Previous prime number is 89
Is Prime? no
Number parity odd
Number length 4
Sum of Digits 19
Digital Root 1
Name
seven thousand nine hundred twenty-one
Scientific notation
7.921 × 10^3
Engineering notation
7.921 × 10^3
Prime Factorization
89 × 89
Composite number
ω
Distinct Factors
1
Total number of distinct prime factors
Ω
Total Factors
2
Total number of prime factors
rad
Radical
89
Product of the distinct prime numbers
The prime factorization of 7921 is 89 × 89.
Since it has a total of 2 prime factors.
4 , 6 , 93 , 28 , 754 , 924 , 8779 , 655 , 73496 , 33989 , 806693 , 121716 , 1355597 , 120181 , 50877429 , 50584214 , 159098524 , 251742050 , 9390178101 , 5911605929
n×2
15842
n×3
23763
n×4
31684
n×5
39605
n÷2
3960.5
n÷3
2640.3333333333
n÷3
1980.25
n÷5
1584.2
n2
62742241
n3
496981290961
n4
3936588805702081
n5
3.1181719929966E+19
2 √n
89
3 √n
19.933948768546
4 √n
9.4339811320566
5 √n
6.0222114833056
3 divisors
τ
Total Divisors
3
Total number of the positive divisors of n
σ
Sum of Divisors
1
Sum of all the positive divisors of n
s
Aliquot Sum
-7920
Sum of the proper positive divisors of n
A
Arithmetic Mean
0.33333333333333
Returns the sum of divisors (σ(n )) divided by the total number of divisors (τ(n ))
G
Geometric Mean
1
Returns the nth root of the product of n divisors
H
Harmonic Mean
3
Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 7921 can be divided by 3 positive divisors.
The sum of these divisors (counting 7921) is 1, the average is 0.33333333333333.
Base
System
Value
2
Binary
1111011110001
3
Ternary
101212101
4
Quaternary
1323301
5
Quinary
223141
6
Senary
100401
8
Octal
17361
10
Decimal
7921
12
Duodecimal
4701
16
Hexadecimal
1ef1
20
Vigesimal
jg1
36
Base36
641
md5
ad62cfd33e3870262d6bf5331c1f13b0
sha1
5b5dfb76344dd298236b67f20cdb8318db4f8aaa
sha256
d66b138c54ab92e2b9c23cff02db4961c4a4c905b1d71b4fc93a3e64a3919f13
sha512
0fb1f4aa12562dda95d221008287a73b6c302e3d2724b751117fda4b51156fc5c09467dd99f4994508120005da0b98daf4bb81f2033aec14b512b5a03e9a4d8c
ripemd-160
5a3b7c133ef0be109a5a76d1bfca71fd27a155ca
Diameter
15842
Circumference
49769.11081817
Area
197110563.39536
Volume
2081750363539.5
Surface area
788442253.58144
Circumference
49769.11081817
Perimeter
31684
Area
62742241
Diagonal
11201.985627557
Surface area
376453446
Volume
496981290961
Space diagonal
13719.574446753
Perimeter
23763
Area
27168187.298183
Altitude
6859.7872233765
Surface area
27168187.298183
Volume
58569806826.895
Height
3733.9952091858