25391816 has 16 divisors (see below), whose sum is σ = 49680000. Its totient is φ = 12143824.

The previous prime is 25391813. The next prime is 25391827. The reversal of 25391816 is 61819352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25391813) 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 3 ways as a sum of consecutive naturals, for example, 68816 + ... + 69183.

It is an arithmetic number, because the mean of its divisors is an integer number (3105000).

Almost surely, 2^25391816 is an apocalyptic number.

It is an amenable number.

25391816 is a deficient number, since it is larger than the sum of its proper divisors (24288184).

25391816 is a wasteful number, since it uses less digits than its factorization.

25391816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138028 (or 138024 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 25391816 is about 5039.0292715959. The cubic root of 25391816 is about 293.9214314865.

The spelling of 25391816 in words is "twenty-five million, three hundred ninety-one thousand, eight hundred sixteen".