25897986 has 24 divisors (see below), whose sum is σ = 58048380. Its totient is φ = 8334816.

The previous prime is 25897981. The next prime is 25898009. The reversal of 25897986 is 68979852.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22382361 + 3515625 = 4731^2 + 1875^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25897981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24285 + ... + 25328.

Almost surely, 2^25897986 is an apocalyptic number.

25897986 is an abundant number, since it is smaller than the sum of its proper divisors (32150394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25897986 is a wasteful number, since it uses less digits than its factorization.

25897986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49650 (or 49647 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 25897986 is about 5089.0063863194. The cubic root of 25897986 is about 295.8616424848.

The spelling of 25897986 in words is "twenty-five million, eight hundred ninety-seven thousand, nine hundred eighty-six".