12388321 has 4 divisors (see below), whose sum is σ = 13514544. Its totient is φ = 11262100.

The previous prime is 12388309. The next prime is 12388339.

12388321 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12388321 - 2¹¹ = 12386273 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 12388321.

It is not an unprimeable number, because it can be changed into a prime (12388381) 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, 563095 + ... + 563116.

It is an arithmetic number, because the mean of its divisors is an integer number (3378636).

Almost surely, 2^12388321 is an apocalyptic number.

12388321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12388321 is a deficient number, since it is larger than the sum of its proper divisors (1126223).

12388321 is a wasteful number, since it uses less digits than its factorization.

12388321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126222.

The product of its digits is 2304, while the sum is 28.

The square root of 12388321 is about 3519.7046751113. The cubic root of 12388321 is about 231.3862157301.

It can be divided in two parts, 123883 and 21, that added together give a square (123904 = 352²).

The spelling of 12388321 in words is "twelve million, three hundred eighty-eight thousand, three hundred twenty-one".