12398689 has 4 divisors (see below), whose sum is σ = 12826260. Its totient is φ = 11971120.

The previous prime is 12398671. The next prime is 12398693. The reversal of 12398689 is 98689321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98689321 = 3733 ⋅26437.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 2739025 = 3108^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 12398689 - 2²³ = 4010081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12398669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213742 + ... + 213799.

It is an arithmetic number, because the mean of its divisors is an integer number (3206565).

Almost surely, 2^12398689 is an apocalyptic number.

It is an amenable number.

12398689 is a deficient number, since it is larger than the sum of its proper divisors (427571).

12398689 is an equidigital number, since it uses as much as digits as its factorization.

12398689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427570.

The product of its digits is 186624, while the sum is 46.

The square root of 12398689 is about 3521.1772179202. The cubic root of 12398689 is about 231.4507481053.

The spelling of 12398689 in words is "twelve million, three hundred ninety-eight thousand, six hundred eighty-nine".