25856842 has 16 divisors (see below), whose sum is σ = 42473952. Its totient is φ = 11707920.

The previous prime is 25856839. The next prime is 25856843. The reversal of 25856842 is 24865852.

It is a junction number, because it is equal to n+sod(n) for n = 25856795 and 25856804.

It is not an unprimeable number, because it can be changed into a prime (25856843) 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 7 ways as a sum of consecutive naturals, for example, 3973 + ... + 8215.

It is an arithmetic number, because the mean of its divisors is an integer number (2654622).

Almost surely, 2^25856842 is an apocalyptic number.

25856842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25856842 is a deficient number, since it is larger than the sum of its proper divisors (16617110).

25856842 is a wasteful number, since it uses less digits than its factorization.

25856842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4533.

The product of its digits is 153600, while the sum is 40.

The square root of 25856842 is about 5084.9623400769. The cubic root of 25856842 is about 295.7048814729.

The spelling of 25856842 in words is "twenty-five million, eight hundred fifty-six thousand, eight hundred forty-two".