12905565 has 16 divisors (see below), whose sum is σ = 20707008. Its totient is φ = 6863616.

The previous prime is 12905549. The next prime is 12905573. The reversal of 12905565 is 56550921.

It is not a de Polignac number, because 12905565 - 2⁴ = 12905549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5502 + ... + 7488.

It is an arithmetic number, because the mean of its divisors is an integer number (1294188).

Almost surely, 2^12905565 is an apocalyptic number.

12905565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12905565 is a deficient number, since it is larger than the sum of its proper divisors (7801443).

12905565 is a wasteful number, since it uses less digits than its factorization.

12905565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 12905565 is about 3592.4316277419. The cubic root of 12905565 is about 234.5627299473.

The spelling of 12905565 in words is "twelve million, nine hundred five thousand, five hundred sixty-five".