12807745 has 4 divisors (see below), whose sum is σ = 15369300. Its totient is φ = 10246192.

The previous prime is 12807737. The next prime is 12807791. The reversal of 12807745 is 54770821.

It is a happy number.

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 2108304 + 10699441 = 1452^2 + 3271^2 .

It is a cyclic number.

It is not a de Polignac number, because 12807745 - 2³ = 12807737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12807745.

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, 1280770 + ... + 1280779.

It is an arithmetic number, because the mean of its divisors is an integer number (3842325).

Almost surely, 2^12807745 is an apocalyptic number.

It is an amenable number.

12807745 is a deficient number, since it is larger than the sum of its proper divisors (2561555).

12807745 is an equidigital number, since it uses as much as digits as its factorization.

12807745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561554.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 12807745 is about 3578.7909969709. The cubic root of 12807745 is about 233.9685897889.

It can be divided in two parts, 1280 and 7745, that added together give a square (9025 = 95²).

The spelling of 12807745 in words is "twelve million, eight hundred seven thousand, seven hundred forty-five".