odd, composite · 345th positive integer
The number 345
345 is an odd composite number. It is the 345th positive integer.
Quick reference
| Prime factorization | 3 × 5 × 23 |
| Divisors | 1, 3, 5, 15, 23, 69, 115, 345 |
| Binary | 101011001 |
| Hexadecimal | 0x159 |
| Roman numeral | CCCXLV |
| Digit sum | 12 |
| Properties | odd, composite |
Reading 345 in NumGrid context
345 is one of the data points covered by this site’s integer properties and number-guessing puzzles dataset. The detail above comes directly from classical number theory plus NumGrid solver-derived puzzle statistics; the context that follows situates the headline numbers against the broader distribution across positive integers within the NumGrid target pool.
The methodology behind every numeric value on this page is publicly documented on the classical number theory plus NumGrid solver-derived puzzle statistics portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 345’s peers within positive integers within the NumGrid target pool. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Frequently asked
Is 345 a prime number?
No. 345 is composite. Its prime factorization is 3 × 5 × 23.
What are the factors of 345?
The factors (divisors) of 345 are 1, 3, 5, 15, 23, 69, 115, 345.
What is 345 in binary?
345 in binary is 101011001. In hexadecimal it's 159.
What is 345 as a Roman numeral?
345 in Roman numerals is CCCXLV.
What's the digit sum of 345?
Adding the digits of 345: 3 + 4 + 5 = 12.