25396639 has 2 divisors, whose sum is σ = 25396640. Its totient is φ = 25396638.

The previous prime is 25396633. The next prime is 25396687. The reversal of 25396639 is 93669352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25396639 - 2⁹ = 25396127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25396595 and 25396604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25396633) 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, 12698319 + 12698320.

It is an arithmetic number, because the mean of its divisors is an integer number (12698320).

Almost surely, 2^25396639 is an apocalyptic number.

25396639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25396639 is an equidigital number, since it uses as much as digits as its factorization.

25396639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 43.

The square root of 25396639 is about 5039.5078132691. The cubic root of 25396639 is about 293.9400397567.

The spelling of 25396639 in words is "twenty-five million, three hundred ninety-six thousand, six hundred thirty-nine".