12908509 has 6 divisors (see below), whose sum is σ = 13369850. Its totient is φ = 12462576.

The previous prime is 12908453. The next prime is 12908531. The reversal of 12908509 is 90580921.

It can be written as a sum of positive squares in 3 ways, for example, as 1368900 + 11539609 = 1170^2 + 3397^2 .

It is not a de Polignac number, because 12908509 - 2⁷ = 12908381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12908549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6834 + ... + 8515.

Almost surely, 2^12908509 is an apocalyptic number.

It is an amenable number.

12908509 is a deficient number, since it is larger than the sum of its proper divisors (461341).

12908509 is an equidigital number, since it uses as much as digits as its factorization.

12908509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15407 (or 15378 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 12908509 is about 3592.8413546941. The cubic root of 12908509 is about 234.5805646352.

The spelling of 12908509 in words is "twelve million, nine hundred eight thousand, five hundred nine".