12945649 has 4 divisors (see below), whose sum is σ = 12995136. Its totient is φ = 12896164.

The previous prime is 12945641. The next prime is 12945659. The reversal of 12945649 is 94654921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94654921 = 683 ⋅138587.

It is a cyclic number.

It is not a de Polignac number, because 12945649 - 2³ = 12945641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12945641) 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, 24349 + ... + 24874.

It is an arithmetic number, because the mean of its divisors is an integer number (3248784).

Almost surely, 2^12945649 is an apocalyptic number.

It is an amenable number.

12945649 is a deficient number, since it is larger than the sum of its proper divisors (49487).

12945649 is an equidigital number, since it uses as much as digits as its factorization.

12945649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49486.

The product of its digits is 77760, while the sum is 40.

The square root of 12945649 is about 3598.0062534687. The cubic root of 12945649 is about 234.8053254212.

The spelling of 12945649 in words is "twelve million, nine hundred forty-five thousand, six hundred forty-nine".