12580409 has 4 divisors (see below), whose sum is σ = 12620916. Its totient is φ = 12539904.

The previous prime is 12580397. The next prime is 12580411. The reversal of 12580409 is 90408521.

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 1000000 + 11580409 = 1000^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 12580409 - 2¹² = 12576313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12580429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19784 + ... + 20409.

It is an arithmetic number, because the mean of its divisors is an integer number (3155229).

Almost surely, 2^12580409 is an apocalyptic number.

It is an amenable number.

12580409 is a deficient number, since it is larger than the sum of its proper divisors (40507).

12580409 is an equidigital number, since it uses as much as digits as its factorization.

12580409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40506.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12580409 is about 3546.8872268512. The cubic root of 12580409 is about 232.5760124530.

The spelling of 12580409 in words is "twelve million, five hundred eighty thousand, four hundred nine".