25989647 has 2 divisors, whose sum is σ = 25989648. Its totient is φ = 25989646.

The previous prime is 25989643. The next prime is 25989653. The reversal of 25989647 is 74698952.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25989647 - 2² = 25989643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25989595 and 25989604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25989643) 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, 12994823 + 12994824.

It is an arithmetic number, because the mean of its divisors is an integer number (12994824).

Almost surely, 2^25989647 is an apocalyptic number.

25989647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25989647 is an equidigital number, since it uses as much as digits as its factorization.

25989647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 25989647 is about 5098.0042173384. The cubic root of 25989647 is about 296.2102801822.

The spelling of 25989647 in words is "twenty-five million, nine hundred eighty-nine thousand, six hundred forty-seven".