12409009 has 4 divisors (see below), whose sum is σ = 12444516. Its totient is φ = 12373504.

The previous prime is 12408989. The next prime is 12409037. The reversal of 12409009 is 90090421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90090421 = 677 ⋅133073.

It can be written as a sum of positive squares in 2 ways, for example, as 1703025 + 10705984 = 1305^2 + 3272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12409009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12409909) 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, 17224 + ... + 17929.

It is an arithmetic number, because the mean of its divisors is an integer number (3111129).

Almost surely, 2^12409009 is an apocalyptic number.

It is an amenable number.

12409009 is a deficient number, since it is larger than the sum of its proper divisors (35507).

12409009 is an equidigital number, since it uses as much as digits as its factorization.

12409009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35506.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 12409009 is about 3522.6423321138. The cubic root of 12409009 is about 231.5149460034.

The spelling of 12409009 in words is "twelve million, four hundred nine thousand, nine".