12799999 has 4 divisors (see below), whose sum is σ = 12807720. Its totient is φ = 12792280.

The previous prime is 12799987. The next prime is 12800009. The reversal of 12799999 is 99999721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12799999 - 2¹¹ = 12797951 is a prime.

It is a Duffinian number.

12799999 is a modest number, since divided by 9999 gives 1279 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12799909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244 + ... + 5065.

It is an arithmetic number, because the mean of its divisors is an integer number (3201930).

Almost surely, 2^12799999 is an apocalyptic number.

12799999 is a deficient number, since it is larger than the sum of its proper divisors (7721).

12799999 is an equidigital number, since it uses as much as digits as its factorization.

12799999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720.

The product of its digits is 826686, while the sum is 55.

The square root of 12799999 is about 3577.7086242454. The cubic root of 12799999 is about 233.9214129653.

It can be divided in two parts, 1279 and 9999, that multiplied together give a palindrome (12788721).

The spelling of 12799999 in words is "twelve million, seven hundred ninety-nine thousand, nine hundred ninety-nine".