8399

8399 is the natural number that follows 8398 and precedes 8400. In mathematics it is an odd composite number and is classified as a semiprime, since it factors into exactly two prime numbers: 37 and 227.

The prime factorization of 8399 is 37 × 227. Here, one factor (37) is below the square root of 8399 (which is approximately 91.7) and the other (227) is above it. This makes 8399 a product of two distinct primes and not a prime power.

In decimal form, the digits are 8, 3, 9, 9. The sum of digits is 29, giving a digital root of 2. The number is not a palindrome in base 10. It has various representations in other bases: in binary it is 10000011001111, in hexadecimal it is 0x20CF, and in octal it is 20317.

As a relatively small semiprime, 8399 is sometimes cited in discussions of integer factorization, cryptographic examples, or numerical exercises. It does not correspond to a widely known constant, historical year, or named mathematical object.

See also: semiprime, prime factorization, numeral systems.