25805729 has 2 divisors, whose sum is σ = 25805730. Its totient is φ = 25805728.

The previous prime is 25805707. The next prime is 25805771. The reversal of 25805729 is 92750852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 5085025 = 4552^2 + 2255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25805729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25805692 and 25805701.

It is not a weakly prime, because it can be changed into another prime (25805029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12902864 + 12902865.

It is an arithmetic number, because the mean of its divisors is an integer number (12902865).

Almost surely, 2^25805729 is an apocalyptic number.

It is an amenable number.

25805729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25805729 is an equidigital number, since it uses as much as digits as its factorization.

25805729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 25805729 is about 5079.9339562636. The cubic root of 25805729 is about 295.5099062092.

The spelling of 25805729 in words is "twenty-five million, eight hundred five thousand, seven hundred twenty-nine".