25808947 has 2 divisors, whose sum is σ = 25808948. Its totient is φ = 25808946.

The previous prime is 25808929. The next prime is 25808977. The reversal of 25808947 is 74980852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25808947 - 2¹¹ = 25806899 is a prime.

It is a super-2 number, since 2×25808947² = 1332203490497618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25808977) 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, 12904473 + 12904474.

It is an arithmetic number, because the mean of its divisors is an integer number (12904474).

Almost surely, 2^25808947 is an apocalyptic number.

25808947 is a deficient number, since it is larger than the sum of its proper divisors (1).

25808947 is an equidigital number, since it uses as much as digits as its factorization.

25808947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 25808947 is about 5080.2506827912. The cubic root of 25808947 is about 295.5221891582.

The spelling of 25808947 in words is "twenty-five million, eight hundred eight thousand, nine hundred forty-seven".