Factors of 403, in Maths, are the natural numbers that can divide the original number, in a uniform manner. The factorisation of any number, results in the product form of factors. 403 is an odd number and is a composite number, also. A composite number, by definition, has more than two factors.
403 can also be expressed as the product of two factors that results in the original number. Such two factors are called pair factors. Also, the prime factorisation of a number is the product of prime numbers or prime factors. In this article, we will find all the factors of 403 along with their pair factors and prime factors.
How to Find the Factors of 403?
We can use the simple division method to find the factors of 403. In this method, we divide the actual number, by a set of natural numbers, such that the remainder is zero.

Therefore, there are four factors of 403. They are 1, 13, 31 and 403.
More Factors
Pair Factors of 403
The factors in pairs, when multiplied together, result in the original number. Therefore, the pair factors of 403 are:
 1 × 403 = 403
 13 × 31 = 403
Or
 403 × 1 = 403
 31 × 13 = 403
Therefore, the pair factors of 403 are (1, 403) and (13, 31).
Now, if we consider negative pair factors , they will result in the actual number, after multiplication.
 1 × 403 = 403
 13 × 31 = 403
Therefore, the negative pair factors are (1, 403) or (13, 31).
Prime Factorisation of 403
The prime factors of 403 are the prime numbers that can be determined by the prime factorisation method.
Step 1: Divide 403 by the prime number 13
403/13 = 31
Step 2: Divide 31 by itself
31/31 = 1
Therefore, the prime factorisation of 403 is 13 x 31 and the prime factors of 403 are 13 and 31.
Prime factorisation of 403 = 13 x 31
Exponential form = 13^{1} x 31^{1} 
Solved Examples
Q.1: What is the sum of factors of 403?
Solution: The factors of 403 are 1, 13, 31 and 403.
Sum = 1 + 13 + 31 + 403 = 448
Therefore, the sum of factors of 403 is 448.
Q.2: Is 403 divisible by 3, evenly?
Solution: If we divide 403 by 3, then we get:
403/3 = 134.333…
Since a fraction cannot be a factor of a natural number, therefore 403 is not divisible by 3.
Q.3: What is the GCF of 403, 434, and 465?
Solution: The factors of 403, 434 and 465, respectively, are:
403 → 1, 13, 31, 403
434 → 1, 2, 7, 14, 31, 62, 217, 434
465 → 1, 3, 5, 15, 31, 93, 155, 465
Therefore, the GCF of 403, 434 and 465 is 31.
Q.4: What are the common factors of 186 and 403?
Solution: The factors of 186 and 403, respectively, are:
186 → 1, 2, 3, 6, 31, 62, 93, 186
403 → 1, 13, 31, 403
Therefore, the common factors of 186 and 403 are 1 and 31.
Q.5: What is the LCM of 186 and 403?
Solution: The LCM or Least common multiple can be determined by listing the factors or prime factorisation method.
Prime factorisation of 186 = 2 x 3 x 31
Prime factorisation of 403 = 13 x 31
Therefore, LCM of 186 and 403 = 2 x 3 x 13 x 31 = 2418
Practice Questions
 What is the average of factors of 403?
 What is the GCF of 303 and 403?
 How many factors does the number 403 have?
 Is 7 a factor of 403?
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Frequently Asked Questions on Factors of 403
What are the factors of 403?
The factors of 403 are 1, 13, 31 and 403.
What is the LCM of 403 and 408?
We can use the prime factorisation method to find the LCM of 403 and 408.
403 → 13 x 31
408 → 2 x 2 x 2 x 3 x 17
LCM = 2 x 2 x 2 x 3 x 13 x 17 x 31 = 164424
Is 403 a prime number?
403 is not a prime number but a composite number.
What are the prime factors of 403?
The prime factors of 403 are 13 and 31.
What are the multiples of 403?
The multiples of 403 are 403, 806, 1209, 1612, 2015, 2418, 2821, 3224, 3627, 4030 and so on.