12555409 has 4 divisors (see below), whose sum is σ = 13216240. Its totient is φ = 11894580.

The previous prime is 12555397. The next prime is 12555443. The reversal of 12555409 is 90455521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12555409 - 2⁷ = 12555281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12555479) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 330387 + ... + 330424.

It is an arithmetic number, because the mean of its divisors is an integer number (3304060).

Almost surely, 2^12555409 is an apocalyptic number.

12555409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12555409 is a deficient number, since it is larger than the sum of its proper divisors (660831).

12555409 is an equidigital number, since it uses as much as digits as its factorization.

12555409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660830.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 12555409 is about 3543.3612573374. The cubic root of 12555409 is about 232.4218506378.

The spelling of 12555409 in words is "twelve million, five hundred fifty-five thousand, four hundred nine".