400500

400500 is a positive integer in decimal notation. It is written as 400500, and is often grouped as 400,500 for readability. The number is even and lies in the 400,000s, placing it in the upper half of the six-digit range.

Mathematical properties: The sum of its digits is 4 + 0 + 0 + 5 + 0 + 0 = 9, so 400500 is divisible by 9 and by 3. Since it ends in 00, it is divisible by 100; hence it is also divisible by 900. The prime factorization is 2^2 × 3^2 × 5^3 × 89, giving 400500 = 900 × 445. Therefore the number is composite.

In base-10 arithmetic, 400500 is a Harshad (or Niven) number because it is divisible by the sum of its digits. This classification is a property of many integers and is often noted in recreational number theory.

Uses and occurrence: In various contexts, 400500 may appear as a numeric identifier, catalog or serial number, or example value in mathematical discussions. It does not denote a widely recognized mathematical constant, theorem, or widely cited historical event. Like many six-digit integers, its significance is mainly contextual rather than universal.

See also: 400, 500, 900, and other related multiples or factorization considerations.