odd, prime · 409th positive integer
The number 409
409 is an odd prime number. It is the 409th positive integer.
Quick reference
| Prime factorization | 409 (prime) |
| Divisors | 1, 409 |
| Binary | 110011001 |
| Hexadecimal | 0x199 |
| Roman numeral | CDIX |
| Digit sum | 13 |
| Properties | odd, prime |
Reading 409 in NumGrid context
The 409 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 409 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 409 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.
Frequently asked
Is 409 a prime number?
Yes. 409 is prime — its only divisors are 1 and itself.
What are the factors of 409?
The factors (divisors) of 409 are 1, 409.
What is 409 in binary?
409 in binary is 110011001. In hexadecimal it's 199.
What is 409 as a Roman numeral?
409 in Roman numerals is CDIX.
What's the digit sum of 409?
Adding the digits of 409: 4 + 0 + 9 = 13.