Is 40239389 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 40 239 389 is a prime number.
Indeed, the definition of a prime numbers is to have exactly two distinct positive divisors, 1 and itself. A number is a divisor of another number when the remainder of Euclid’s division of the second one by the first one is zero. Concerning the number 40 239 389, the only two divisors are 1 and 40 239 389. Therefore 40 239 389 is a prime number.
As a consequence, 40 239 389 is only a multiple of 1 and 40 239 389.
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Since 40239389 is a prime number, 40239389 is also a deficient number, that is to say 40239389 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 40239389 without 40239389 itself (that is 1, by definition!).