GCD of 445, 138, 390, 821 Calculator

Given Input numbers are 445, 138, 390, 821

In the factoring method, we have to find the divisors of all numbers

Divisors of 445 :

The positive integer divisors of 445 that completely divides 445 are.

1, 5, 89, 445

Divisors of 138 :

The positive integer divisors of 138 that completely divides 138 are.

1, 2, 3, 6, 23, 46, 69, 138

Divisors of 390 :

The positive integer divisors of 390 that completely divides 390 are.

1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390

Divisors of 821 :

The positive integer divisors of 821 that completely divides 821 are.

1, 821

GCD of numbers is the greatest common divisor

So, the GCD (445, 138, 390, 821) = 1.

Given numbers are 445, 138, 390, 821

The list of prime factors of all numbers are

Prime factors of 445 are 5 x 89

Prime factors of 138 are 2 x 3 x 23

Prime factors of 390 are 2 x 3 x 5 x 13

Prime factors of 821 are 821

The above numbers do not have any common prime factor. So GCD is 1

Given numbers are 445, 138, 390, 821

GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)

Apply this formula for all numbers.

Step1:

LCM(445, 138) = 61410

GCD(445, 138) = ( 445 x 138 ) / 61410

= 445 / 138

= 445

Step2:

LCM(1, 390) = 390

GCD(1, 390) = ( 1 x 390 ) / 390

= 1 / 390

= 1

Step3:

LCM(1, 821) = 821

GCD(1, 821) = ( 1 x 821 ) / 821

= 1 / 821

= 1

So, Greatest Common Divisor of 445, 138, 390, 821 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 349, 760, 183, 288
• GCD of 142, 965, 995, 206
• GCD of 150, 238, 451, 870
• GCD of 102, 697, 660, 261
• GCD of 802, 208, 411, 497

Given numbers are 445, 138, 390, 821
The greatest common divisor of numbers 445, 138, 390, 821 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 445, 138, 390, 821 is 1.

1. What is the GCD of 445, 138, 390, 821?

GCD of given numbers 445, 138, 390, 821 is 1

2. How to calculate the greatest common divisor of 445, 138, 390, 821?

We can find the highest common divisor of 445, 138, 390, 821 easily using the prime factorization method. Just list the prime factors of all numbers and pick the highest common factor which is the GCD of 445, 138, 390, 821 i.e 1.

3. How can I use the GCD of 445, 138, 390, 821Calculator?

Out the numbers 445, 138, 390, 821 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.