25684847 has 2 divisors, whose sum is σ = 25684848. Its totient is φ = 25684846.

The previous prime is 25684829. The next prime is 25684849. The reversal of 25684847 is 74848652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25684847 - 2⁸ = 25684591 is a prime.

It is a super-2 number, since 2×25684847² = 1319422730826818, which contains 22 as substring.

Together with 25684849, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25684798 and 25684807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25684849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12842423 + 12842424.

It is an arithmetic number, because the mean of its divisors is an integer number (12842424).

Almost surely, 2^25684847 is an apocalyptic number.

25684847 is a deficient number, since it is larger than the sum of its proper divisors (1).

25684847 is an equidigital number, since it uses as much as digits as its factorization.

25684847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 430080, while the sum is 44.

The square root of 25684847 is about 5068.0220007415. The cubic root of 25684847 is about 295.0477639791.

The spelling of 25684847 in words is "twenty-five million, six hundred eighty-four thousand, eight hundred forty-seven".