453

453 is a natural number that follows 452 and precedes 454. It is odd and composite.

Its prime factorization is 3 × 151, giving four divisors: 1, 3, 151, and 453. Consequently, 453 is a semiprime and a deficient number, since the sum of its proper divisors (1 + 3 + 151 = 155) is less than 453.

In different numeral systems, 453 is 0x1C5 in hexadecimal, 0o705 in octal, and 0b111000101 in binary. In Roman numerals it is CDLIII. The digits 4, 5, and 3 have a digit sum of 12, and the digital root is 3.

In the calendar, the year 453 CE is notable for the death of Attila the Hun, an event often cited as a turning point in late antiquity; the exact circumstances of his death remain uncertain.

In science, 453 nanometers falls in the blue region of the visible spectrum.

As a number, 453 serves as a designation in various contexts, such as catalog numbers, route numbers, or identifiers, but it has no universally recognized significance beyond its arithmetic properties.