12956945 has 4 divisors (see below), whose sum is σ = 15548340. Its totient is φ = 10365552.

The previous prime is 12956927. The next prime is 12956947. The reversal of 12956945 is 54965921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54965921 = 293 ⋅187597.

It can be written as a sum of positive squares in 2 ways, for example, as 7349521 + 5607424 = 2711^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 12956945 - 2¹⁶ = 12891409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12956947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295690 + ... + 1295699.

It is an arithmetic number, because the mean of its divisors is an integer number (3887085).

Almost surely, 2^12956945 is an apocalyptic number.

It is an amenable number.

12956945 is a deficient number, since it is larger than the sum of its proper divisors (2591395).

12956945 is an equidigital number, since it uses as much as digits as its factorization.

12956945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591394.

The product of its digits is 97200, while the sum is 41.

The square root of 12956945 is about 3599.5756694366. The cubic root of 12956945 is about 234.8736003520.

The spelling of 12956945 in words is "twelve million, nine hundred fifty-six thousand, nine hundred forty-five".