25705247 has 4 divisors (see below), whose sum is σ = 25994160. Its totient is φ = 25416336.

The previous prime is 25705219. The next prime is 25705249. The reversal of 25705247 is 74250752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25705247 - 2¹⁶ = 25639711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25705249) 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 in 3 ways as a sum of consecutive naturals, for example, 144323 + ... + 144500.

It is an arithmetic number, because the mean of its divisors is an integer number (6498540).

Almost surely, 2^25705247 is an apocalyptic number.

25705247 is a deficient number, since it is larger than the sum of its proper divisors (288913).

25705247 is an equidigital number, since it uses as much as digits as its factorization.

25705247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288912.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 25705247 is about 5070.0342207918. The cubic root of 25705247 is about 295.1258564770.

Adding to 25705247 its reverse (74250752), we get a palindrome (99955999).

It can be divided in two parts, 25705 and 247, that added together give a palindrome (25952).

The spelling of 25705247 in words is "twenty-five million, seven hundred five thousand, two hundred forty-seven".