12809999 has 8 divisors (see below), whose sum is σ = 13172208. Its totient is φ = 12450240.

The previous prime is 12809987. The next prime is 12810013. The reversal of 12809999 is 99990821.

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

It is a cyclic number.

It is not a de Polignac number, because 12809999 - 2⁴ = 12809983 is a prime.

It is a Duffinian number.

12809999 is a modest number, since divided by 9999 gives 1280 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12809969) 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, 15884 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (1646526).

Almost surely, 2^12809999 is an apocalyptic number.

12809999 is a deficient number, since it is larger than the sum of its proper divisors (362209).

12809999 is an equidigital number, since it uses as much as digits as its factorization.

12809999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 12809999 is about 3579.1058939350. The cubic root of 12809999 is about 233.9823141478.

The spelling of 12809999 in words is "twelve million, eight hundred nine thousand, nine hundred ninety-nine".