12398431 has 4 divisors (see below), whose sum is σ = 13051000. Its totient is φ = 11745864.

The previous prime is 12398429. The next prime is 12398467. The reversal of 12398431 is 13489321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12398431 - 2¹ = 12398429 is a prime.

It is a super-2 number, since 2×12398431² = 307442182523522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 12398393 and 12398402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12398471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326256 + ... + 326293.

It is an arithmetic number, because the mean of its divisors is an integer number (3262750).

Almost surely, 2^12398431 is an apocalyptic number.

12398431 is a deficient number, since it is larger than the sum of its proper divisors (652569).

12398431 is an equidigital number, since it uses as much as digits as its factorization.

12398431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652568.

The product of its digits is 5184, while the sum is 31.

The square root of 12398431 is about 3521.1405822546. The cubic root of 12398431 is about 231.4491427015.

The spelling of 12398431 in words is "twelve million, three hundred ninety-eight thousand, four hundred thirty-one".