12993389 has 4 divisors (see below), whose sum is σ = 13757724. Its totient is φ = 12229056.

The previous prime is 12993373. The next prime is 12993391. The reversal of 12993389 is 98339921.

12993389 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 917764 = 3475^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 12993389 - 2⁴ = 12993373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12993329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382142 + ... + 382175.

It is an arithmetic number, because the mean of its divisors is an integer number (3439431).

Almost surely, 2^12993389 is an apocalyptic number.

It is an amenable number.

12993389 is a deficient number, since it is larger than the sum of its proper divisors (764335).

12993389 is an equidigital number, since it uses as much as digits as its factorization.

12993389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764334.

The product of its digits is 104976, while the sum is 44.

The square root of 12993389 is about 3604.6343781305. The cubic root of 12993389 is about 235.0936038762.

The spelling of 12993389 in words is "twelve million, nine hundred ninety-three thousand, three hundred eighty-nine".