12984809 has 6 divisors (see below), whose sum is σ = 13704570. Its totient is φ = 12301056.

The previous prime is 12984791. The next prime is 12984869. The reversal of 12984809 is 90848921.

It can be written as a sum of positive squares in only one way, i.e., 12759184 + 225625 = 3572^2 + 475^2 .

It is not a de Polignac number, because 12984809 - 2⁸ = 12984553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12984869) 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 5 ways as a sum of consecutive naturals, for example, 17624 + ... + 18345.

It is an arithmetic number, because the mean of its divisors is an integer number (2284095).

Almost surely, 2^12984809 is an apocalyptic number.

12984809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12984809 is a deficient number, since it is larger than the sum of its proper divisors (719761).

12984809 is an equidigital number, since it uses as much as digits as its factorization.

12984809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36007 (or 35988 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 12984809 is about 3603.4440470195. Note that the first 3 decimals coincide. The cubic root of 12984809 is about 235.0418455738.

The spelling of 12984809 in words is "twelve million, nine hundred eighty-four thousand, eight hundred nine".