25853987 has 4 divisors (see below), whose sum is σ = 25864320. Its totient is φ = 25843656.

The previous prime is 25853959. The next prime is 25853999. The reversal of 25853987 is 78935852.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25853987 - 2⁸ = 25853731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25853917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1214 + ... + 7292.

It is an arithmetic number, because the mean of its divisors is an integer number (6466080).

Almost surely, 2^25853987 is an apocalyptic number.

25853987 is a deficient number, since it is larger than the sum of its proper divisors (10333).

25853987 is an equidigital number, since it uses as much as digits as its factorization.

25853987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332.

The product of its digits is 604800, while the sum is 47.

The square root of 25853987 is about 5084.6816026178. The cubic root of 25853987 is about 295.6939975901.

It can be divided in two parts, 258 and 53987, that added together give a palindrome (54245).

The spelling of 25853987 in words is "twenty-five million, eight hundred fifty-three thousand, nine hundred eighty-seven".