25408729 has 2 divisors, whose sum is σ = 25408730. Its totient is φ = 25408728.

The previous prime is 25408679. The next prime is 25408739. The reversal of 25408729 is 92780452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21874329 + 3534400 = 4677^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 25408729 - 2⁷ = 25408601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25408739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12704364 + 12704365.

It is an arithmetic number, because the mean of its divisors is an integer number (12704365).

Almost surely, 2^25408729 is an apocalyptic number.

It is an amenable number.

25408729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25408729 is an equidigital number, since it uses as much as digits as its factorization.

25408729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 25408729 is about 5040.7071924483. The cubic root of 25408729 is about 293.9866754724.

The spelling of 25408729 in words is "twenty-five million, four hundred eight thousand, seven hundred twenty-nine".