12309231 has 8 divisors (see below), whose sum is σ = 17904384. Its totient is φ = 7460120.

The previous prime is 12309191. The next prime is 12309233. The reversal of 12309231 is 13290321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12309231 - 2⁷ = 12309103 is a prime.

It is a super-2 number, since 2×12309231² = 303034335622722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12309198 and 12309207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309233) 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, 186471 + ... + 186536.

It is an arithmetic number, because the mean of its divisors is an integer number (2238048).

Almost surely, 2^12309231 is an apocalyptic number.

12309231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12309231 is a deficient number, since it is larger than the sum of its proper divisors (5595153).

12309231 is a wasteful number, since it uses less digits than its factorization.

12309231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373021.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 12309231 is about 3508.4513677690. The cubic root of 12309231 is about 230.8927558256.

Adding to 12309231 its reverse (13290321), we get a palindrome (25599552).

The spelling of 12309231 in words is "twelve million, three hundred nine thousand, two hundred thirty-one".