12398 has 4 divisors (see below), whose sum is σ = 18600. Its totient is φ = 6198.

The previous prime is 12391. The next prime is 12401. The reversal of 12398 is 89321.

12398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89321 = 179 ⋅499.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3098 + ... + 3101.

It is an arithmetic number, because the mean of its divisors is an integer number (4650).

2¹²³⁹⁸ is an apocalyptic number.

12398 is a deficient number, since it is larger than the sum of its proper divisors (6202).

12398 is an equidigital number, since it uses as much as digits as its factorization.

12398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6201.

The product of its digits is 432, while the sum is 23.

The square root of 12398 is about 111.3463066294. The cubic root of 12398 is about 23.1446460756.

Adding to 12398 its sum of digits (23), we get a palindrome (12421).

The spelling of 12398 in words is "twelve thousand, three hundred ninety-eight".