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138

138 is a natural number that comes after 137 and before 139. In mathematics, it is an even composite number. Its prime factorization is 2 × 3 × 23, hence it has eight divisors: 1, 2, 3, 6, 23, 46, 69, and 138. The sum of all positive divisors is 288, making 138 an abundant number since the sum of its proper divisors (150) exceeds 138.

In numeral systems, 138 is represented as 10001010 in binary, 0x8A in hexadecimal, and 212 in octal.

As a calendar reference, 138 is the 138th day of the year. In non-leap years it falls

Other notes: 138 is divisible by 2 and 3, and is thus divisible by 6; it is

In
Roman
numerals,
it
is
written
as
CXXXVIII.
on
May
18,
and
in
leap
years
on
May
17.
not
a
prime
and
not
a
power
of
a
prime.
It
is
square-free
since
its
prime
factors
are
distinct.
In
base-10
digit
terms,
the
digits
sum
to
12,
which
is
a
multiple
of
3,
consistent
with
divisibility
by
3.