3215

3215 is a natural number that follows 3214 and precedes 3216. In number theory, it is an odd composite number with prime factorization 5 × 643, making it a semiprime. Its positive divisors are 1, 5, 643, and 3215.

In common numeral systems, 3215 is represented as decimal 3215; in binary it is 110010001111; in hexadecimal it is 0xC8F; in octal it is 6217. In Roman numerals it is written as MMMCCXV, corresponding to 3000 + 200 + 15.

From a mathematical perspective, 3215 has several elementary properties. The digit sum is 3 + 2 + 1 + 5 = 11. It is congruent to 3 modulo 4 and 2 modulo 3, and it is divisible by 5. The Euler totient of 3215 is φ(3215) = (5 − 1)(643 − 1) = 4 × 642 = 2568, since 3215 = 5 × 643 with both factors prime.

Because it is the product of two distinct primes, 3215 is a typical example used in discussions of semiprimes, factorization, and related arithmetic concepts. It illustrates how a number can be composite yet have a relatively small set of divisors, and how different base representations encode the same value.