12938945 has 4 divisors (see below), whose sum is σ = 15526740. Its totient is φ = 10351152.

The previous prime is 12938941. The next prime is 12938971. The reversal of 12938945 is 54983921.

12938945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54983921 = 79 ⋅695999.

It can be written as a sum of positive squares in 2 ways, for example, as 5326864 + 7612081 = 2308^2 + 2759^2 .

It is a cyclic number.

It is not a de Polignac number, because 12938945 - 2² = 12938941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12938941) 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, 1293890 + ... + 1293899.

It is an arithmetic number, because the mean of its divisors is an integer number (3881685).

Almost surely, 2^12938945 is an apocalyptic number.

It is an amenable number.

12938945 is a deficient number, since it is larger than the sum of its proper divisors (2587795).

12938945 is an equidigital number, since it uses as much as digits as its factorization.

12938945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587794.

The product of its digits is 77760, while the sum is 41.

The square root of 12938945 is about 3597.0745057616. The cubic root of 12938945 is about 234.7647865316.

The spelling of 12938945 in words is "twelve million, nine hundred thirty-eight thousand, nine hundred forty-five".