124

124 is an even integer in the middle range of the natural numbers. It factors as 2^2 × 31, so it is composite but not a square. The positive divisors are 1, 2, 4, 31, 62, and 124, giving it six divisors in total. It is congruent to 0 modulo 2 and modulo 4, and it lies between 123 and 125 on the number line.

In decimal notation it is written as 124. In other common bases, it equals binary 1111100, octal 174, and hexadecimal 7C. In Roman numerals it is CXXIV. The ASCII character corresponding to decimal 124 is the vertical bar, '|'.

As a year label, 124 may appear in historical dating, such as 124 CE in the Julian calendar era; the exact historical events associated with that year vary by source. In mathematics, 124 is not a prime, nor a square, and it is not a Harshad number since 1 + 2 + 4 = 7 does not divide 124. It is one of many even, composite integers with the prime factorization 2^2 × 31.