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0440

0440 is a four-digit numeric string that can function as an identifier, a code, or a padded representation of the decimal number 440. The leading zero is a common convention in computing and data exchange to preserve fixed-width formats, such as serial numbers, catalog entries, or configuration parameters.

In mathematics, 440 denotes the decimal value behind the label. It factors as 2^3 × 5 ×

In computing and information technology, 0440 is often seen as an octal permission mode in Unix-like systems.

In music, the number 440 is widely associated with standard concert pitch, where A above middle C

Historically, the year 440 CE is a point on the Julian calendar, during late antiquity, used in

11.
It
is
divisible
by
1,
2,
4,
5,
8,
10,
11,
20,
22,
40,
44,
55,
88,
110,
and
440.
It
is
a
Harshad
number
since
440
is
divisible
by
the
sum
of
its
digits
(4+4+0
=
8;
440/8
=
55).
In
Roman
numerals,
440
is
CDXL.
The
digits
indicate
read
permission
for
the
owner
and
the
group,
with
no
permissions
for
others
(owner:
read,
group:
read,
others:
none).
The
leading
zero
signals
octal
notation.
is
set
to
440
Hz
(A440).
While
0440
is
not
itself
a
musical
term,
the
figure
440
frequently
appears
in
tuners
and
tuning
references,
occasionally
padded
in
fixed-width
displays
as
0440.
historical
chronology
to
place
events
and
developments
of
the
era.