25968389 has 2 divisors, whose sum is σ = 25968390. Its totient is φ = 25968388.

The previous prime is 25968377. The next prime is 25968391. The reversal of 25968389 is 98386952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25300900 + 667489 = 5030^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 25968389 - 2⁴ = 25968373 is a prime.

It is a Sophie Germain prime.

Together with 25968391, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25968589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12984194 + 12984195.

It is an arithmetic number, because the mean of its divisors is an integer number (12984195).

Almost surely, 2^25968389 is an apocalyptic number.

It is an amenable number.

25968389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25968389 is an equidigital number, since it uses as much as digits as its factorization.

25968389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 25968389 is about 5095.9188572818. The cubic root of 25968389 is about 296.1294973006.

The spelling of 25968389 in words is "twenty-five million, nine hundred sixty-eight thousand, three hundred eighty-nine".