25984257 has 24 divisors (see below), whose sum is σ = 38263104. Its totient is φ = 15672384.

The previous prime is 25984247. The next prime is 25984289. The reversal of 25984257 is 75248952.

It is not a de Polignac number, because 25984257 - 2⁴ = 25984241 is a prime.

It is a super-2 number, since 2×25984257² = 1350363223684098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25984207) 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 23 ways as a sum of consecutive naturals, for example, 26388 + ... + 27354.

It is an arithmetic number, because the mean of its divisors is an integer number (1594296).

Almost surely, 2^25984257 is an apocalyptic number.

It is an amenable number.

25984257 is a deficient number, since it is larger than the sum of its proper divisors (12278847).

25984257 is a wasteful number, since it uses less digits than its factorization.

25984257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1036 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 25984257 is about 5097.4755516824. The cubic root of 25984257 is about 296.1898017228.

The spelling of 25984257 in words is "twenty-five million, nine hundred eighty-four thousand, two hundred fifty-seven".