25906985 has 8 divisors (see below), whose sum is σ = 33479880. Its totient is φ = 19131264.

The previous prime is 25906973. The next prime is 25906987. The reversal of 25906985 is 58960952.

It can be written as a sum of positive squares in 4 ways, for example, as 1857769 + 24049216 = 1363^2 + 4904^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25906985 - 2¹⁸ = 25644841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25906987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199220 + ... + 199349.

It is an arithmetic number, because the mean of its divisors is an integer number (4184985).

Almost surely, 2^25906985 is an apocalyptic number.

It is an amenable number.

25906985 is a deficient number, since it is larger than the sum of its proper divisors (7572895).

25906985 is a wasteful number, since it uses less digits than its factorization.

25906985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398587.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 25906985 is about 5089.8904703343. The cubic root of 25906985 is about 295.8959070617.

The spelling of 25906985 in words is "twenty-five million, nine hundred six thousand, nine hundred eighty-five".