190

190 is a natural number that follows 189 and precedes 191. It is even and composite, with a prime factorization of 2 × 5 × 19.

Its divisors are 1, 2, 5, 10, 19, 38, 95, and 190. The sum of all divisors is 360, and the sum of proper divisors is 170, making 190 a deficient number. The number has eight divisors, and Euler's totient φ(190) equals 72. In base-10 arithmetic, 190 is a Harshad (Niven) number since it is divisible by the sum of its digits (1 + 9 + 0 = 10).

In base representations, 190 is 10111110 in binary, 276 in octal, and BE in hexadecimal. In Roman numerals it is CXC. In Unicode it corresponds to code point U+00BE, the character for the vulgar fraction three quarters; in Latin-1 / ISO-8859-1, decimal 190 also maps to the same character ¾.