12939393 has 4 divisors (see below), whose sum is σ = 17252528. Its totient is φ = 8626260.

The previous prime is 12939391. The next prime is 12939449. The reversal of 12939393 is 39393921.

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 not a de Polignac number, because 12939393 - 2¹ = 12939391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12939391) 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, 2156563 + ... + 2156568.

It is an arithmetic number, because the mean of its divisors is an integer number (4313132).

Almost surely, 2^12939393 is an apocalyptic number.

It is an amenable number.

12939393 is a deficient number, since it is larger than the sum of its proper divisors (4313135).

12939393 is an equidigital number, since it uses as much as digits as its factorization.

12939393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313134.

The product of its digits is 39366, while the sum is 39.

The square root of 12939393 is about 3597.1367780500. The cubic root of 12939393 is about 234.7674960109.

The spelling of 12939393 in words is "twelve million, nine hundred thirty-nine thousand, three hundred ninety-three".