25409239 has 2 divisors, whose sum is σ = 25409240. Its totient is φ = 25409238.

The previous prime is 25409221. The next prime is 25409261. The reversal of 25409239 is 93290452.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25409239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25419239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12704619 + 12704620.

It is an arithmetic number, because the mean of its divisors is an integer number (12704620).

Almost surely, 2^25409239 is an apocalyptic number.

25409239 is a deficient number, since it is larger than the sum of its proper divisors (1).

25409239 is an equidigital number, since it uses as much as digits as its factorization.

25409239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 25409239 is about 5040.7577803342. The cubic root of 25409239 is about 293.9886424107.

The spelling of 25409239 in words is "twenty-five million, four hundred nine thousand, two hundred thirty-nine".