25936409 has 2 divisors, whose sum is σ = 25936410. Its totient is φ = 25936408.

The previous prime is 25936403. The next prime is 25936423. The reversal of 25936409 is 90463952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24285184 + 1651225 = 4928^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 25936409 - 2⁸ = 25936153 is a prime.

It is not a weakly prime, because it can be changed into another prime (25936403) 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, 12968204 + 12968205.

It is an arithmetic number, because the mean of its divisors is an integer number (12968205).

Almost surely, 2^25936409 is an apocalyptic number.

It is an amenable number.

25936409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25936409 is an equidigital number, since it uses as much as digits as its factorization.

25936409 is an odious number, because the sum of its binary digits is odd.

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

The square root of 25936409 is about 5092.7800855721. The cubic root of 25936409 is about 296.0078864772.

The spelling of 25936409 in words is "twenty-five million, nine hundred thirty-six thousand, four hundred nine".