The number 405 is a composite number because 405 can be divided by one, by itself and at least by 3 and 5. A composite number is an integer that can be divided by at least another natural number, besides itself and 1, without leaving a remainder (divided exactly). The factorization or decomposition of 405 = 34•5.

5 is one of the factors! The orange divisor(s) above are the prime factors of the number 405. If we put all of it together we have the factors 3 x 3 x 3 x 3 x 5 = 405. It can also be written in exponential form as 34 x 51.

The list of all positive divisors (i.e., the list of all integers that divide 405) is as follows: 1, 3, 5, 9, 15, 27, 45, 81, 135, 405.

The square root of 405 is expressed as √405 in the radical form and as (405)½ or (405)0.5 in the exponent form….Square Root of 405.

405 is divisible by 5 if 405 divided by 5 results in a whole number with no remainder. The last digit of 405 is 5. Therefore, 405 is divisible by 5.

The ones digit in 405 is the last digit (very right digit) which is 5. Therefore, 405 is not divisible by 10.

The last digit in 567 is 7, thus 567 is not divisible by 2.

Therefore, the LCM of 21 and 54 is 378.

Detailed Answer: The Greatest Common Factor (GCF) for 19 and 48, notation CGF(19,48), is 1.

150

Greatest common factor (GCF) of 12 and 48 is 12.

3