25897257 has 6 divisors (see below), whose sum is σ = 37407162. Its totient is φ = 17264832.

The previous prime is 25897237. The next prime is 25897271. The reversal of 25897257 is 75279852.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 8433216 = 4179^2 + 2904^2 .

It is not a de Polignac number, because 25897257 - 2²² = 21702953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25897217) 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 in 5 ways as a sum of consecutive naturals, for example, 1438728 + ... + 1438745.

It is an arithmetic number, because the mean of its divisors is an integer number (6234527).

Almost surely, 2^25897257 is an apocalyptic number.

It is an amenable number.

25897257 is a deficient number, since it is larger than the sum of its proper divisors (11509905).

25897257 is a wasteful number, since it uses less digits than its factorization.

25897257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877479 (or 2877476 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 25897257 is about 5088.9347608316. The cubic root of 25897257 is about 295.8588663981.

The spelling of 25897257 in words is "twenty-five million, eight hundred ninety-seven thousand, two hundred fifty-seven".