12820789 has 2 divisors, whose sum is σ = 12820790. Its totient is φ = 12820788.

The previous prime is 12820783. The next prime is 12820799. The reversal of 12820789 is 98702821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11675889 + 1144900 = 3417^2 + 1070^2 .

It is a cyclic number.

It is not a de Polignac number, because 12820789 - 2¹⁵ = 12788021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12820783) 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 as a sum of consecutive naturals, namely, 6410394 + 6410395.

It is an arithmetic number, because the mean of its divisors is an integer number (6410395).

Almost surely, 2^12820789 is an apocalyptic number.

It is an amenable number.

12820789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820789 is an equidigital number, since it uses as much as digits as its factorization.

12820789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 12820789 is about 3580.6129363560. The cubic root of 12820789 is about 234.0479909848.

The spelling of 12820789 in words is "twelve million, eight hundred twenty thousand, seven hundred eighty-nine".