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398

398 is a natural number that comes after 397 and before 399. It is an even composite number with prime factorization 2 × 199, where 199 is a prime. As a product of two primes, 398 is a semiprime and has exactly four positive divisors: 1, 2, 199, and 398.

In base representations, 398 equals 110001110 in binary, 616 in octal, and 0x18E in hexadecimal. In Roman

As the 199th even number, 398 = 2 × 199 is divisible by 2 but not by any

See also: semiprimes, Roman numerals, base conversion.

numerals,
it
is
written
as
CCCXCVIII.
Geographically
or
culturally,
398
does
not
correspond
to
a
widely
recognized
ordinal
or
year
without
additional
context.
smaller
primes
beyond
2
and
199.
The
sum
of
its
digits
is
20,
so
398
is
not
a
Harshad
number
in
base
10.
The
sum
of
all
positive
divisors
of
398
is
600,
and
the
sum
of
its
proper
divisors
is
202.