25804397 has 2 divisors, whose sum is σ = 25804398. Its totient is φ = 25804396.

The previous prime is 25804391. The next prime is 25804399. The reversal of 25804397 is 79340852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15888196 + 9916201 = 3986^2 + 3149^2 .

It is a cyclic number.

It is not a de Polignac number, because 25804397 - 2¹⁴ = 25788013 is a prime.

Together with 25804399, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25804397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25804391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12902198 + 12902199.

It is an arithmetic number, because the mean of its divisors is an integer number (12902199).

Almost surely, 2^25804397 is an apocalyptic number.

It is an amenable number.

25804397 is a deficient number, since it is larger than the sum of its proper divisors (1).

25804397 is an equidigital number, since it uses as much as digits as its factorization.

25804397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 25804397 is about 5079.8028505051. The cubic root of 25804397 is about 295.5048217315.

The spelling of 25804397 in words is "twenty-five million, eight hundred four thousand, three hundred ninety-seven".