MathQuarryCalculators

Numbers / 399

The Number 399

399 is composite: factorization 3 × 7 × 19. That gives 399 exactly 8 divisors: 1, 3, 7, 19, 21, 57, 133, 399. 399's proper divisors total just 241, 158 short of 399, the deficient case most of 399's neighbors share too. 399 has a digit sum of 21; for 399, the digital root works out to 3. 399: 3, 7 all divide 399 evenly, out of 2-12. 399 is 110001111 in binary and 18F in hex; as a Roman numeral it's CCCXCIX.

Factors
1, 3, 7, 19, 21, 57, 133, 399
Number of factors
8
Prime?
No
Prime factorization
3 x 7 x 19
Even or odd
Odd
Square
159201
Cube
63521199
Binary
110001111
Hexadecimal
18F
Roman numeral
CCCXCIX
Perfect square?
No
Perfect cube?
No
Perfect number?
No
Triangular number?
No
Fibonacci number?
No
Factors of 399 in detail →Is 399 prime? →