12789977 has 2 divisors, whose sum is σ = 12789978. Its totient is φ = 12789976.

The previous prime is 12789971. The next prime is 12789979. The reversal of 12789977 is 77998721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10896601 + 1893376 = 3301^2 + 1376^2 .

It is an emirp because it is prime and its reverse (77998721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12789977 - 2¹⁶ = 12724441 is a prime.

Together with 12789979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12789971) 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, 6394988 + 6394989.

It is an arithmetic number, because the mean of its divisors is an integer number (6394989).

Almost surely, 2^12789977 is an apocalyptic number.

It is an amenable number.

12789977 is a deficient number, since it is larger than the sum of its proper divisors (1).

12789977 is an equidigital number, since it uses as much as digits as its factorization.

12789977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 50.

The square root of 12789977 is about 3576.3077328440. The cubic root of 12789977 is about 233.8603459678.

The spelling of 12789977 in words is "twelve million, seven hundred eighty-nine thousand, nine hundred seventy-seven".