One hundred twenty-four (124, CXXIV) is the natural number following 123 and preceding 125.

Cardinal	124 one hundred [and] twenty-four
Ordinal	124th one hundred [and] twenty-fourth
Factorization
Divisors	2, 4, 31, 62
Roman numeral	CXXIV
Binary	1111100
Octal	174
Duodecimal	A4
Hexadecimal	7C

It is the sum of eight consecutive primes (5 + 7 + 11 + 13 + 17 + 19 + 23 + 29). It is a nontotient since there is no integer with 124 coprimes below it, and it is an untouchable number since there is no integer whose proper divisors add up to 124.

One hundred twenty-four is also:

• The year AD 124 or 124 BC.