25686985 has 8 divisors (see below), whose sum is σ = 30953736. Its totient is φ = 20463360.

The previous prime is 25686979. The next prime is 25686989. The reversal of 25686985 is 58968652.

It can be written as a sum of positive squares in 4 ways, for example, as 14235529 + 11451456 = 3773^2 + 3384^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25686985 - 2²¹ = 23589833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25686989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9454 + ... + 11863.

It is an arithmetic number, because the mean of its divisors is an integer number (3869217).

Almost surely, 2^25686985 is an apocalyptic number.

It is an amenable number.

25686985 is a deficient number, since it is larger than the sum of its proper divisors (5266751).

25686985 is a wasteful number, since it uses less digits than its factorization.

25686985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21563.

The product of its digits is 1036800, while the sum is 49.

The square root of 25686985 is about 5068.2329267704. The cubic root of 25686985 is about 295.0559503184.

The spelling of 25686985 in words is "twenty-five million, six hundred eighty-six thousand, nine hundred eighty-five".