25782389 has 2 divisors, whose sum is σ = 25782390. Its totient is φ = 25782388.

The previous prime is 25782349. The next prime is 25782391. The reversal of 25782389 is 98328752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25654225 + 128164 = 5065^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 25782389 - 2¹² = 25778293 is a prime.

Together with 25782391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25782349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12891194 + 12891195.

It is an arithmetic number, because the mean of its divisors is an integer number (12891195).

Almost surely, 2^25782389 is an apocalyptic number.

It is an amenable number.

25782389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25782389 is an equidigital number, since it uses as much as digits as its factorization.

25782389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 25782389 is about 5077.6361626253. The cubic root of 25782389 is about 295.4207879925.

The spelling of 25782389 in words is "twenty-five million, seven hundred eighty-two thousand, three hundred eighty-nine".