12804805 has 16 divisors (see below), whose sum is σ = 17120880. Its totient is φ = 9128448.

The previous prime is 12804793. The next prime is 12804809. The reversal of 12804805 is 50840821.

It can be written as a sum of positive squares in 8 ways, for example, as 2762244 + 10042561 = 1662^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 12804805 - 2⁵ = 12804773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12804809) 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 15 ways as a sum of consecutive naturals, for example, 1512 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (1070055).

Almost surely, 2^12804805 is an apocalyptic number.

It is an amenable number.

12804805 is a deficient number, since it is larger than the sum of its proper divisors (4316075).

12804805 is a wasteful number, since it uses less digits than its factorization.

12804805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 12804805 is about 3578.3802201555. The cubic root of 12804805 is about 233.9506860311.

It can be divided in two parts, 1280 and 4805, that multiplied together give a square (6150400 = 2480²).

The spelling of 12804805 in words is "twelve million, eight hundred four thousand, eight hundred five".