405 (number)

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.

Interesting facts

Basic properties

Name

Name four hundred five

Notation

Scientific notation 4.05 × 10^2
Engineering notation 4.05 × 10^0

Prime Factorization of 405

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.

Most popular turbo-numbers

Basic calculations (n = 405)

Multiplication

n×y
n×2 810
n×3 1215
n×4 1620
n×5 2025

Division

n÷y
n÷2 202.5
n÷3 135
n÷3 101.25
n÷5 81

Exponentiation

ny
n2 164025
n3 66430125
n4 26904200625
n5 10896201253125

Nth Root

y√n
2√n 20.124611797498
3√n 7.3986362229914
4√n 4.4860463436637
5√n 3.3226990297449

Divisors of 405

1, 3, 9, 15, 27, 45, 135, 405

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 conversion 405

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

Cryptographic Hash Functions

md5 bbcbff5c1f1ded46c25d28119a85c6c2
sha1 7ee51d9582ef3d3b56ec2fc25b77fc147d8563e5
sha256 a73b320dc0d3a57c03f897eb28ca91e623c5ee635db59476ba3178c90b94019f
sha512 204b63d5bcc68fe268f5afda89f25a1fda2218508f08a09d67bf80261312973c13ab4698cc95862a2a4b6b11499d4c8ddb19aeccd57364d635a7b8adba972250
ripemd-160 3f85238eefaa71524fa666740a9499445b662ef9

405 as geometric shapes

Circle

Radius = n
Diameter 810
Circumference 2544.6900494077
Area 515299.73500507

Sphere

Radius = n
Volume 278261856.90274
Surface area 2061198.9400203
Circumference 2544.6900494077

Square

Length = n
Perimeter 1620
Area 164025
Diagonal 572.7564927611

Cube

Length = n
Surface area 984150
Volume 66430125
Space diagonal 701.4805770654

Equilateral Triangle

Length = n
Perimeter 1215
Area 71024.908427871
Altitude 350.7402885327

Triangular Pyramid

Length = n
Surface area 71024.908427871
Volume 7828865.3104283
Height 190.91883092037