12309438 has 16 divisors (see below), whose sum is σ = 25191936. Its totient is φ = 4007640.

The previous prime is 12309433. The next prime is 12309457. The reversal of 12309438 is 83490321.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309431) 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 7 ways as a sum of consecutive naturals, for example, 23598 + ... + 24113.

It is an arithmetic number, because the mean of its divisors is an integer number (1574496).

Almost surely, 2^12309438 is an apocalyptic number.

12309438 is an abundant number, since it is smaller than the sum of its proper divisors (12882498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12309438 is a wasteful number, since it uses less digits than its factorization.

12309438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47759.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 12309438 is about 3508.4808678401. The cubic root of 12309438 is about 230.8940500990.

Adding to 12309438 its reverse (83490321), we get a palindrome (95799759).

The spelling of 12309438 in words is "twelve million, three hundred nine thousand, four hundred thirty-eight".