12947765 has 4 divisors (see below), whose sum is σ = 15537324. Its totient is φ = 10358208.

The previous prime is 12947731. The next prime is 12947771. The reversal of 12947765 is 56774921.

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 1503076 + 11444689 = 1226^2 + 3383^2 .

It is a cyclic number.

It is not a de Polignac number, because 12947765 - 2²² = 8753461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 1294772 + ... + 1294781.

It is an arithmetic number, because the mean of its divisors is an integer number (3884331).

Almost surely, 2^12947765 is an apocalyptic number.

It is an amenable number.

12947765 is a deficient number, since it is larger than the sum of its proper divisors (2589559).

12947765 is an equidigital number, since it uses as much as digits as its factorization.

12947765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589558.

The product of its digits is 105840, while the sum is 41.

The square root of 12947765 is about 3598.3002931940. The cubic root of 12947765 is about 234.8181179046.

The spelling of 12947765 in words is "twelve million, nine hundred forty-seven thousand, seven hundred sixty-five".