21781438 is an even 8-digits composite number following 21781437
and preceding 21781439 . In scientific notation, it is written as 2.1781438 × 10^7.
The sum of its digits is 34. It has a total of 3 prime factors and 8 positive divisors.
There are 9334896 positive integers (up to 21781438) that are relatively prime to 21781438.
21781438 has 8 divisors, whose sum is 37339632
The reverse of 21781438 is 83418712
Previous prime number is 7
Is Prime? no
Number parity even
Number length 8
Sum of Digits 34
Digital Root 7
Name
twenty-one million seven hundred eighty-one thousand four hundred thirty-eight
Scientific notation
2.1781438 × 10^7
Engineering notation
2.1781438 × 10^6
Prime Factorization
2 × 7 × 1555817
Composite number
ω
Distinct Factors
3
Total number of distinct prime factors
Ω
Total Factors
3
Total number of prime factors
rad
Radical
21781438
Product of the distinct prime numbers
The prime factorization of 21781438 is 2 × 7 × 1555817.
Since it has a total of 3 prime factors.
10 , 8 , 76 , 11 , 997 , 247 , 7417 , 3978 , 91163 , 17972 , 70344 , 79570 , 9190905 , 5218002 , 74444824 , 24000141 , 580019943 , 171073020 , 4558089417 , 6046532089
n×2
43562876
n×3
65344314
n×4
87125752
n×5
108907190
n÷2
10890719
n÷3
7260479.3333333
n÷3
5445359.5
n÷5
4356287.6
n2
474431041347844
n3
1.0333790312394E+22
n4
2.250848129944E+29
n5
4.9026708989791E+36
2 √n
4667.0588168567
3 √n
279.2729351222
4 √n
68.315875291595
5 √n
29.350622025803
8 divisors
τ
Total Divisors
8
Total number of the positive divisors of n
σ
Sum of Divisors
1
Sum of all the positive divisors of n
s
Aliquot Sum
-21781437
Sum of the proper positive divisors of n
A
Arithmetic Mean
0.125
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
8
Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 21781438 can be divided by 8 positive divisors.
The sum of these divisors (counting 21781438) is 1, the average is 0.125.
Base
System
Value
2
Binary
1010011000101101110111110
3
Ternary
1111222121111221
4
Quaternary
1103011232332
5
Quinary
21034001223
6
Senary
2054503554
8
Octal
123055676
10
Decimal
21781438
12
Duodecimal
7364bba
16
Hexadecimal
14c5bbe
20
Vigesimal
6g2dbi
36
Base36
cyuny
md5
4def77b0814283dfaa797809941f3d7c
sha1
1ceaa1f2dca8290360b477f9c090c19ce3c7e458
sha256
dc52f333ddb7772d4277bf636e8406139a3fa37be9019dc81260e3ce72faf9f3
sha512
b2043b45f9f55a9d0d6a4b76029673f46500158438f1524271d31151deb2d72a057b6ad738f406e4c2b5f76fded20463221b9c0f810e72178f194fd56bada642
ripemd-160
ff0a80702fc41eb7636ca449255b6229cf088acc
Diameter
43562876
Circumference
136856811.21084
Area
1.4904690741333E+15
Volume
4.328607963887E+22
Surface area
5.9618762965334E+15
Circumference
136856811.21084
Perimeter
87125752
Area
474431041347844
Diagonal
30803605.027589
Surface area
2846586248087064
Volume
1.0333790312394E+22
Space diagonal
37726557.277911
Perimeter
65344314
Area
2.0543466707557E+14
Altitude
18863278.638956
Surface area
2.0543466707557E+14
Volume
1.2178488675422E+21
Height
10267868.34253