25172847 has 24 divisors (see below), whose sum is σ = 41693184. Its totient is φ = 14336784.

The previous prime is 25172843. The next prime is 25172867. The reversal of 25172847 is 74827152.

It is not a de Polignac number, because 25172847 - 2² = 25172843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25172843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28738 + ... + 29600.

It is an arithmetic number, because the mean of its divisors is an integer number (1737216).

Almost surely, 2^25172847 is an apocalyptic number.

25172847 is a deficient number, since it is larger than the sum of its proper divisors (16520337).

25172847 is a wasteful number, since it uses less digits than its factorization.

25172847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339 (or 1336 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 25172847 is about 5017.2549267503. The cubic root of 25172847 is about 293.0741036498.

Adding to 25172847 its reverse (74827152), we get a palindrome (99999999).

The spelling of 25172847 in words is "twenty-five million, one hundred seventy-two thousand, eight hundred forty-seven".