25242439 has 2 divisors, whose sum is σ = 25242440. Its totient is φ = 25242438.

The previous prime is 25242389. The next prime is 25242443. The reversal of 25242439 is 93424252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25242439 - 2⁹ = 25241927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25242439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25242449) 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, 12621219 + 12621220.

It is an arithmetic number, because the mean of its divisors is an integer number (12621220).

Almost surely, 2^25242439 is an apocalyptic number.

25242439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25242439 is an equidigital number, since it uses as much as digits as its factorization.

25242439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 25242439 is about 5024.1854066107. The cubic root of 25242439 is about 293.3439293980.

It can be divided in two parts, 2524243 and 9, that added together give a palindrome (2524252).

The spelling of 25242439 in words is "twenty-five million, two hundred forty-two thousand, four hundred thirty-nine".