25439717 has 2 divisors, whose sum is σ = 25439718. Its totient is φ = 25439716.

The previous prime is 25439681. The next prime is 25439741. The reversal of 25439717 is 71793452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23049601 + 2390116 = 4801^2 + 1546^2 .

It is a cyclic number.

It is not a de Polignac number, because 25439717 - 2⁶ = 25439653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25436717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12719858 + 12719859.

It is an arithmetic number, because the mean of its divisors is an integer number (12719859).

Almost surely, 2^25439717 is an apocalyptic number.

It is an amenable number.

25439717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25439717 is an equidigital number, since it uses as much as digits as its factorization.

25439717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 25439717 is about 5043.7800308895. The cubic root of 25439717 is about 294.1061404291.

The spelling of 25439717 in words is "twenty-five million, four hundred thirty-nine thousand, seven hundred seventeen".