25668389 has 4 divisors (see below), whose sum is σ = 25768524. Its totient is φ = 25568256.

The previous prime is 25668371. The next prime is 25668397. The reversal of 25668389 is 98386652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23203489 + 2464900 = 4817^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 25668389 - 2²⁰ = 24619813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25668329) 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 3 ways as a sum of consecutive naturals, for example, 49682 + ... + 50195.

It is an arithmetic number, because the mean of its divisors is an integer number (6442131).

Almost surely, 2^25668389 is an apocalyptic number.

It is an amenable number.

25668389 is a deficient number, since it is larger than the sum of its proper divisors (100135).

25668389 is an equidigital number, since it uses as much as digits as its factorization.

25668389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100134.

The product of its digits is 622080, while the sum is 47.

The square root of 25668389 is about 5066.3980301591. The cubic root of 25668389 is about 294.9847315664.

The spelling of 25668389 in words is "twenty-five million, six hundred sixty-eight thousand, three hundred eighty-nine".