489999999

489,999,999 is a positive integer in the decimal system. It is equal to 490,000,000 minus 1, placing it just below the round number 490,000,000 and making it the nine-digit number immediately before that boundary.

Mathematically, the number is composite. It is divisible by 3 because the sum of its digits is 75, and 489,999,999 divided by 3 equals 163,333,333. The quotient, 163,333,333, is not divisible by 3, indicating that the full prime factorization involves factors other than 3. In addition to being divisible by 3, the number is odd and not divisible by 2 or 5. It is congruent to 3 modulo 9, 3 modulo 4, and 7 modulo 8.

In its decimal representation, the digits are 4, 8, followed by seven 9s, yielding 489,999,999. Its position relative to nearby round numbers (just under 490,000,000) is sometimes noted in discussions of numerical boundaries and formatting.

As a nine-digit integer near a major decimal milestone, 489,999,999 is often encountered as an example in explanations of arithmetic properties, modular arithmetic, and the behavior of large integers in general discussions.