12409509 has 8 divisors (see below), whose sum is σ = 18909760. Its totient is φ = 7091136.

The previous prime is 12409471. The next prime is 12409519. The reversal of 12409509 is 90590421.

It is a happy number.

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

It is not a de Polignac number, because 12409509 - 2⁷ = 12409381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12409519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295444 + ... + 295485.

It is an arithmetic number, because the mean of its divisors is an integer number (2363720).

Almost surely, 2^12409509 is an apocalyptic number.

It is an amenable number.

12409509 is a deficient number, since it is larger than the sum of its proper divisors (6500251).

12409509 is an equidigital number, since it uses as much as digits as its factorization.

12409509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590939.

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

The square root of 12409509 is about 3522.7133008521. The cubic root of 12409509 is about 231.5180554625.

The spelling of 12409509 in words is "twelve million, four hundred nine thousand, five hundred nine".