405 is an odd 3-digits composite number following 404
and preceding 406 . In scientific notation, it is written as 4.05 × 10^2.
The sum of its digits is 9. It has a total of 4 prime factors and 8 positive divisors.
There are 216 positive integers (up to 405) that are relatively prime to 405.
405 has 8 divisors, whose sum is 640
The reverse of 405 is 504
Previous prime number is 3
Is Prime? no
Number parity odd
Number length 3
Sum of Digits 9
Digital Root 9
Scientific notation
4.05 × 10^2
Engineering notation
4.05 × 10^0
Prime Factorization
15 × 3 × 3 × 3
Composite number
ω
Distinct Factors
2
Total number of distinct prime factors
Ω
Total Factors
4
Total number of prime factors
rad
Radical
45
Product of the distinct prime numbers
The prime factorization of 405 is 15 × 3 × 3 × 3.
Since it has a total of 4 prime factors.
6 , 2 , 55 , 38 , 1000 , 4 , 8538 , 7133 , 90590 , 68619 , 625337 , 477306 , 8531685 , 9214771 , 64235813 , 80232577 , 144367209 , 870826038 , 2610837947 , 4457577540
n×2
810
n×3
1215
n×4
1620
n×5
2025
n÷2
202.5
n÷3
135
n÷3
101.25
n÷5
81
n2
164025
n3
66430125
n4
26904200625
n5
10896201253125
2 √n
20.124611797498
3 √n
7.3986362229914
4 √n
4.4860463436637
5 √n
3.3226990297449
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
-404
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 405 can be divided by 8 positive divisors.
The sum of these divisors (counting 405) is 1, the average is 0.125.
Base
System
Value
2
Binary
110010101
3
Ternary
120000
4
Quaternary
12111
5
Quinary
3110
6
Senary
1513
8
Octal
625
10
Decimal
405
12
Duodecimal
299
16
Hexadecimal
195
20
Vigesimal
105
36
Base36
b9
md5
bbcbff5c1f1ded46c25d28119a85c6c2
sha1
7ee51d9582ef3d3b56ec2fc25b77fc147d8563e5
sha256
a73b320dc0d3a57c03f897eb28ca91e623c5ee635db59476ba3178c90b94019f
sha512
204b63d5bcc68fe268f5afda89f25a1fda2218508f08a09d67bf80261312973c13ab4698cc95862a2a4b6b11499d4c8ddb19aeccd57364d635a7b8adba972250
ripemd-160
3f85238eefaa71524fa666740a9499445b662ef9
Diameter
810
Circumference
2544.6900494077
Area
515299.73500507
Volume
278261856.90274
Surface area
2061198.9400203
Circumference
2544.6900494077
Perimeter
1620
Area
164025
Diagonal
572.7564927611
Surface area
984150
Volume
66430125
Space diagonal
701.4805770654
Perimeter
1215
Area
71024.908427871
Altitude
350.7402885327
Surface area
71024.908427871
Volume
7828865.3104283
Height
190.91883092037