12758321 has 4 divisors (see below), whose sum is σ = 12774132. Its totient is φ = 12742512.

The previous prime is 12758309. The next prime is 12758323. The reversal of 12758321 is 12385721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12385721 = 547 ⋅22643.

It can be written as a sum of positive squares in 2 ways, for example, as 1795600 + 10962721 = 1340^2 + 3311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12758321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12758323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6626 + ... + 8331.

It is an arithmetic number, because the mean of its divisors is an integer number (3193533).

Almost surely, 2^12758321 is an apocalyptic number.

It is an amenable number.

12758321 is a deficient number, since it is larger than the sum of its proper divisors (15811).

12758321 is an equidigital number, since it uses as much as digits as its factorization.

12758321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15810.

The product of its digits is 3360, while the sum is 29.

The square root of 12758321 is about 3571.8791972854. The cubic root of 12758321 is about 233.6672468657.

The spelling of 12758321 in words is "twelve million, seven hundred fifty-eight thousand, three hundred twenty-one".