7978

7978 is a natural number that lies between 7977 and 7979. It is an even, composite integer.

In terms of factorization, 7978 = 2 × 3989. The number 3989 is prime, so 7978 is a semiprime (the product of two primes). Its divisors are 1, 2, 3989, and 7978.

In different numeral systems, 7978 has the following representations. In binary, it is 1101101000010_2, and in hexadecimal, it is 1F2A_16. The decimal digits of 7978 are 7, 9, 7, and 8, with a digit sum of 31, giving a digital root of 4. Consequently, it is not divisible by 3 or 9, and it ends in 8, so it is not divisible by 5.

As a four-digit integer, 7978 does not have any widely noted special status in mathematics beyond its basic properties as a semiprime. Like many integers, it may appear in various practical contexts as a model number, identifier, or catalog entry, but there is no canonical mathematical theorem or widely cited event uniquely associated with this specific number.