12799721 has 4 divisors (see below), whose sum is σ = 13963344. Its totient is φ = 11636100.

The previous prime is 12799693. The next prime is 12799723.

12799721 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12799721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12799723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581795 + ... + 581816.

It is an arithmetic number, because the mean of its divisors is an integer number (3490836).

Almost surely, 2^12799721 is an apocalyptic number.

12799721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12799721 is a deficient number, since it is larger than the sum of its proper divisors (1163623).

12799721 is a wasteful number, since it uses less digits than its factorization.

12799721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163622.

The product of its digits is 15876, while the sum is 38.

The square root of 12799721 is about 3577.6697723518. The cubic root of 12799721 is about 233.9197194594.

The spelling of 12799721 in words is "twelve million, seven hundred ninety-nine thousand, seven hundred twenty-one".