12387321 has 24 divisors (see below), whose sum is σ = 19119360. Its totient is φ = 7711200.

The previous prime is 12387313. The next prime is 12387329. The reversal of 12387321 is 12378321.

It is an interprime number because it is at equal distance from previous prime (12387313) and next prime (12387329).

It is not a de Polignac number, because 12387321 - 2³ = 12387313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12387329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7326 + ... + 8856.

It is an arithmetic number, because the mean of its divisors is an integer number (796640).

Almost surely, 2^12387321 is an apocalyptic number.

It is an amenable number.

12387321 is a deficient number, since it is larger than the sum of its proper divisors (6732039).

12387321 is a wasteful number, since it uses less digits than its factorization.

12387321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597 (or 1594 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 12387321 is about 3519.5626148713. The cubic root of 12387321 is about 231.3799896391.

The spelling of 12387321 in words is "twelve million, three hundred eighty-seven thousand, three hundred twenty-one".