187
CLXXXVII
10111011
The number 187 — factors and divisors
Deficient
187 = 11 × 17. It has 4 divisors, adding up to 216.
Its divisors, itself excluded, add up to less than the number.
Laid out as dots
It fits as 11 × 17. The more divisors, the closer to a square.
- Prime factors
- 11 × 17
- Divisors
- 1, 11, 17, 187
- Sum of divisors
- 216
- Sum without itself
- 29
- Coprime below it
- 160
- Digit sum
- 16
- Digital root
- 7
- Roman numeral
- CLXXXVII
- Binary
- 10111011
- Octal
- 273
- Hexadecimal
- BB
- Base 36
- 57
- Bits
- 8 bits
- Collatz steps
- 44 steps · peaks at 952
- Prime before
- 181
- Prime after
- 191
The grid
Ten per row, twenty rows. The filled cells are primes — you can see the multiples of 2 and 5 drop out in columns.
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Numbers either side
How to read this
- The prime factors are what the number is made of. The count and sum of divisors both follow from them.
- Add the divisors, take the number away, and you get perfect, abundant or deficient.
- The length of the binary form is the bit count. 255 taking eight digits is what a byte is.
- Collatz: halve it if even, triple it and add one if odd. The count is how many moves reach 1.
Frequently asked questions
Q. Is 187 a prime number?
No. It breaks down into 11 × 17.
Q. What are the divisors of 187?
1, 11, 17, 187 — 4 divisors in all, adding up to 216.
Q. How is 187 written in binary?
10111011, which is 8 bits. In hexadecimal it is BB.
Q. How many Collatz steps does 187 take?
It reaches 1 in 44, peaking at 952 on the way.