12809399 has 4 divisors (see below), whose sum is σ = 13107336. Its totient is φ = 12511464.

The previous prime is 12809359. The next prime is 12809491. The reversal of 12809399 is 99390821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99390821 = 463 ⋅214667.

It is a cyclic number.

It is not a de Polignac number, because 12809399 - 2²⁰ = 11760823 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 (12809359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148904 + ... + 148989.

It is an arithmetic number, because the mean of its divisors is an integer number (3276834).

Almost surely, 2^12809399 is an apocalyptic number.

12809399 is a deficient number, since it is larger than the sum of its proper divisors (297937).

12809399 is an equidigital number, since it uses as much as digits as its factorization.

12809399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297936.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 12809399 is about 3579.0220731367. The cubic root of 12809399 is about 233.9786609708.

The spelling of 12809399 in words is "twelve million, eight hundred nine thousand, three hundred ninety-nine".