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Fünfzehn

Fünfzehn is the German word for the number fifteen. It is written as fünzehn in lowercase when spelled in running text and is represented numerically as 15, with the Roman numeral XV also used in some contexts. In German-language writing, fifteens like this are common for ages, dates, quantities, and numbering.

Etymology and usage in German. The German numbers from thirteen to nineteen are formed by combining the

Mathematical properties. As a number, 15 is odd and composite, with prime factors 3 and 5. It

Cultural use. In German-speaking contexts, fünzehn appears in everyday language for ages, dates, sports scores, and

base
digits
with
the
word
zehn
(ten):
dreizehn
(13),
vierzehn
(14),
fünzehn
(15),
sechzehn
(16),
siebzehn
(17),
achtzehn
(18),
neunzehn
(19).
The
form
fün
fanzzehn
reflects
regular
phonetic
and
spelling
patterns
that
differentiate
them
from
the
base
digits
when
counting
beyond
twelve.
is
the
fifth
triangular
number,
equal
to
the
sum
of
the
integers
from
1
to
5
(1
+
2
+
3
+
4
+
5
=
15)
and
can
also
be
expressed
as
the
sum
of
three
consecutive
integers
(4
+
5
+
6).
In
broader
mathematics,
15
is
often
encountered
in
discussions
of
divisors,
modular
arithmetic,
and
simple
factorization.
other
counts.
The
term
also
appears
as
a
title
or
label
in
various
works
or
media,
where
the
number
fifteen
can
carry
symbolic
or
thematic
significance,
depending
on
the
context.