25690439 has 2 divisors, whose sum is σ = 25690440. Its totient is φ = 25690438.

The previous prime is 25690411. The next prime is 25690447. The reversal of 25690439 is 93409652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25690439 - 2⁸ = 25690183 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 (25690459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845219 + 12845220.

It is an arithmetic number, because the mean of its divisors is an integer number (12845220).

Almost surely, 2^25690439 is an apocalyptic number.

25690439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25690439 is an equidigital number, since it uses as much as digits as its factorization.

25690439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 25690439 is about 5068.5736652435. The cubic root of 25690439 is about 295.0691746235.

The spelling of 25690439 in words is "twenty-five million, six hundred ninety thousand, four hundred thirty-nine".