129000

129000 is a positive integer in the base-10 numeral system. It equals 129 × 1000 and is the successor of 128999 and the predecessor of 129001. As a rounded-thousand value, it frequently appears in estimates, measurements, and labeling schemes.

Mathematically, 129000 is composite and even. Its prime factorization is 2^3 × 3 × 5^3 × 43. It is divisible by 8, 3, 5, 10, 15, and 30, among other divisors. The sum of its digits is 12, making it a Harshad number in base 10 (129000 ÷ 12 = 10750). In scientific notation, it is written as 1.29 × 10^5.

Because it ends with three zeros, 129000 is a multiple of 1000. In decimal form the trailing zeros reflect this factorization; in other bases the representation is more complex.

In practical contexts, 129000 can appear as a count, budget figure, or duration. For example, 129000 seconds equal 35 hours and 50 minutes, and 129000 bytes are roughly 126 kilobytes of data (approximately 126 KiB).