12820709 has 8 divisors (see below), whose sum is σ = 14012352. Its totient is φ = 11633440.

The previous prime is 12820699. The next prime is 12820711. The reversal of 12820709 is 90702821.

It is a happy number.

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 12820709 - 2⁴ = 12820693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820789) 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 7 ways as a sum of consecutive naturals, for example, 9872 + ... + 11094.

It is an arithmetic number, because the mean of its divisors is an integer number (1751544).

Almost surely, 2^12820709 is an apocalyptic number.

It is an amenable number.

12820709 is a deficient number, since it is larger than the sum of its proper divisors (1191643).

12820709 is a wasteful number, since it uses less digits than its factorization.

12820709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 12820709 is about 3580.6017650669. The cubic root of 12820709 is about 234.0475041744.

The spelling of 12820709 in words is "twelve million, eight hundred twenty thousand, seven hundred nine".