12957305 has 4 divisors (see below), whose sum is σ = 15548772. Its totient is φ = 10365840.

The previous prime is 12957293. The next prime is 12957311. The reversal of 12957305 is 50375921.

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 8779369 + 4177936 = 2963^2 + 2044^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12957305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295726 + ... + 1295735.

It is an arithmetic number, because the mean of its divisors is an integer number (3887193).

Almost surely, 2^12957305 is an apocalyptic number.

It is an amenable number.

12957305 is a deficient number, since it is larger than the sum of its proper divisors (2591467).

12957305 is an equidigital number, since it uses as much as digits as its factorization.

12957305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591466.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 12957305 is about 3599.6256749834. The cubic root of 12957305 is about 234.8757756002.

The spelling of 12957305 in words is "twelve million, nine hundred fifty-seven thousand, three hundred five".