749999999

749,999,999 is a natural number. It equals 750,000,000 minus 1 and has nine digits, with the decimal representation 7-4-9-9-9-9-9-9-9. It is odd and not divisible by 2 or 5. The sum of its digits is 74, so it is congruent to 2 modulo 9, and it is congruent to 7 modulo 8.

Its prime factorization shows that the number is composite: 749,999,999 = 7 × 107,142,857. The cofactor 107,142,857 contains the well-known six-digit repeating block 142,857, which is the recurring sequence in the decimal expansion of 1/7.

In decimal pattern terms, the number is notable for being just under a round value (750,000,000) and for its simple factorization by 7. It serves as an example of a large composite integer with a concise factorization, illustrating how nine-digit numbers can arise from simple operations such as subtracting 1 from a round billion. The number’s structure also highlights how certain cofactors may themselves exhibit recognizable numerical patterns, such as the appearance of 142,857 within 107,142,857.