23999999

23999999 is a positive integer that equals 24,000,000 minus 1. In decimal notation it is written as 23,999,999, eight digits, and it lies just below 24,000,000.

It is odd and not divisible by 2, 3, or 5. The sum of its digits is 50, so it is not divisible by 3 or 9. It is congruent to -1 modulo 24,000,000, since 23,999,999 ≡ -1 (mod 24,000,000).

The number is coprime with 24,000,000, because the greatest common divisor of 23,999,999 and 24,000,000 is 1. This follows from the identity gcd(a, b) = gcd(b, a mod b) and the fact that 24,000,000 − 1 shares no common prime factors with 24,000,000.

In binary, 23,999,999 requires 25 bits to represent, since 2^24 = 16,777,216 and 2^25 = 33,554,432. It sits in the 20–30 million range and is commonly used as an example of an eight-digit integer in computing contexts.

There is no widely known mathematical significance attached to this specific value beyond its proximity to a round number. It serves as a representative instance of an eight-digit decimal integer used in demonstrations and example calculations.