12405565 has 4 divisors (see below), whose sum is σ = 14886684. Its totient is φ = 9924448.

The previous prime is 12405557. The next prime is 12405571. The reversal of 12405565 is 56550421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56550421 = 523 ⋅108127.

It can be written as a sum of positive squares in 2 ways, for example, as 3896676 + 8508889 = 1974^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 12405565 - 2³ = 12405557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240552 + ... + 1240561.

It is an arithmetic number, because the mean of its divisors is an integer number (3721671).

Almost surely, 2^12405565 is an apocalyptic number.

It is an amenable number.

12405565 is a deficient number, since it is larger than the sum of its proper divisors (2481119).

12405565 is an equidigital number, since it uses as much as digits as its factorization.

12405565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481118.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 12405565 is about 3522.1534605976. The cubic root of 12405565 is about 231.4935257796.

Adding to 12405565 its reverse (56550421), we get a palindrome (68955986).

The spelling of 12405565 in words is "twelve million, four hundred five thousand, five hundred sixty-five".