12977989 has 2 divisors, whose sum is σ = 12977990. Its totient is φ = 12977988.

The previous prime is 12977971. The next prime is 12977999. The reversal of 12977989 is 98977921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11168964 + 1809025 = 3342^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 12977989 - 2¹³ = 12969797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12977929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6488994 + 6488995.

It is an arithmetic number, because the mean of its divisors is an integer number (6488995).

Almost surely, 2^12977989 is an apocalyptic number.

It is an amenable number.

12977989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12977989 is an equidigital number, since it uses as much as digits as its factorization.

12977989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 52.

The square root of 12977989 is about 3602.4976058285. The cubic root of 12977989 is about 235.0006880921. Note that the first 3 decimals are identical.

The spelling of 12977989 in words is "twelve million, nine hundred seventy-seven thousand, nine hundred eighty-nine".