12908809 has 16 divisors (see below), whose sum is σ = 14172480. Its totient is φ = 11715840.

The previous prime is 12908807. The next prime is 12908849. The reversal of 12908809 is 90880921.

12908809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12908809 - 2¹ = 12908807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12908807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56754 + ... + 56980.

It is an arithmetic number, because the mean of its divisors is an integer number (885780).

Almost surely, 2^12908809 is an apocalyptic number.

12908809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12908809 is a deficient number, since it is larger than the sum of its proper divisors (1263671).

12908809 is a wasteful number, since it uses less digits than its factorization.

12908809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 12908809 is about 3592.8831041380. The cubic root of 12908809 is about 234.5823818765.

The spelling of 12908809 in words is "twelve million, nine hundred eight thousand, eight hundred nine".