138129

138129 is a natural number that immediately follows 138128 and precedes 138130. It is an odd, composite integer, often cited in basic arithmetic and number-theory contexts as an example of factorization and divisibility in base-10 notation.

Its prime factorization is 138129 = 3 × 41 × 1123, which shows that the number has several nontrivial divisors. Accordingly, its divisors (besides 1 and itself) include 3, 41, 1123, 123 (3×41), 3369 (3×1123), and 46043 (41×1123).

Digit-wise, the sum of the digits of 138129 is 1+3+8+1+2+9 = 24, giving a digital root of 6. The number is divisible by 3 but not by 9, and it is not a Harshad number because it is not divisible by 24. In modulo arithmetic, 138129 is congruent to 1 modulo 8, since 138129 − 138128 = 1.

In mathematical contexts, 138129 serves as a representative example for illustrating how composite numbers can be decomposed into prime factors and how the divisor structure of a number is determined by its factorization. Its factorization into three primes demonstrates how multiple small primes combine to form a larger composite.