399813

399813 is a number that falls within the range of 399,000 to 400,000. It is an odd number, as it is not divisible by 2. In the decimal system, it is written as 399,813. In scientific notation, it is expressed as 3.99813 x 10^5. The number 399813 is also known as a Harshad number, or a Niven number, because it is divisible by the sum of its digits (3+9+9+8+1+3=33). It is not a prime number, as it has factors other than 1 and itself. The prime factorization of 399813 is 3 x 3 x 11 x 1279. The square root of 399813 is approximately 632.25. The number 399813 is often used in mathematical problems and puzzles, as well as in computer programming and data analysis. It is also sometimes used in cryptography and other fields that require secure communication.