12509409 has 8 divisors (see below), whose sum is σ = 18195552. Its totient is φ = 7581440.

The previous prime is 12509389. The next prime is 12509423. The reversal of 12509409 is 90490521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12509409 - 2⁵ = 12509377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12509479) 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 7 ways as a sum of consecutive naturals, for example, 189504 + ... + 189569.

It is an arithmetic number, because the mean of its divisors is an integer number (2274444).

Almost surely, 2^12509409 is an apocalyptic number.

It is an amenable number.

12509409 is a deficient number, since it is larger than the sum of its proper divisors (5686143).

12509409 is a wasteful number, since it uses less digits than its factorization.

12509409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379087.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 12509409 is about 3536.8642891692. The cubic root of 12509409 is about 232.1376573555.

The spelling of 12509409 in words is "twelve million, five hundred nine thousand, four hundred nine".