12309232 has 80 divisors (see below), whose sum is σ = 27998208. Its totient is φ = 5195520.

The previous prime is 12309191. The next prime is 12309233. The reversal of 12309232 is 23290321.

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

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148263 + ... + 148345.

Almost surely, 2^12309232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12309232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13999104).

12309232 is an abundant number, since it is smaller than the sum of its proper divisors (15688976).

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

12309232 is a wasteful number, since it uses less digits than its factorization.

12309232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 12309232 is about 3508.4515102820. The cubic root of 12309232 is about 230.8927620781.

Adding to 12309232 its reverse (23290321), we get a palindrome (35599553).

The spelling of 12309232 in words is "twelve million, three hundred nine thousand, two hundred thirty-two".