12945209 has 4 divisors (see below), whose sum is σ = 13038480. Its totient is φ = 12851940.

The previous prime is 12945203. The next prime is 12945221. The reversal of 12945209 is 90254921.

12945209 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12945209 - 2¹² = 12941113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12945203) 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, 46427 + ... + 46704.

It is an arithmetic number, because the mean of its divisors is an integer number (3259620).

Almost surely, 2^12945209 is an apocalyptic number.

It is an amenable number.

12945209 is a deficient number, since it is larger than the sum of its proper divisors (93271).

12945209 is an equidigital number, since it uses as much as digits as its factorization.

12945209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93270.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 12945209 is about 3597.9451079748. The cubic root of 12945209 is about 234.8026651834.

The spelling of 12945209 in words is "twelve million, nine hundred forty-five thousand, two hundred nine".