12431389 has 4 divisors (see below), whose sum is σ = 12601756. Its totient is φ = 12261024.

The previous prime is 12431387. The next prime is 12431399. The reversal of 12431389 is 98313421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98313421 = 491 ⋅200231.

It can be written as a sum of positive squares in 2 ways, for example, as 3080025 + 9351364 = 1755^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 12431389 - 2¹ = 12431387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12431389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12431387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85074 + ... + 85219.

It is an arithmetic number, because the mean of its divisors is an integer number (3150439).

Almost surely, 2^12431389 is an apocalyptic number.

It is an amenable number.

12431389 is a deficient number, since it is larger than the sum of its proper divisors (170367).

12431389 is an equidigital number, since it uses as much as digits as its factorization.

12431389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170366.

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

The square root of 12431389 is about 3525.8174938587. The cubic root of 12431389 is about 231.6540436738.

It can be divided in two parts, 124 and 31389, that added together give a palindrome (31513).

The spelling of 12431389 in words is "twelve million, four hundred thirty-one thousand, three hundred eighty-nine".