25638943 has 8 divisors (see below), whose sum is σ = 28259280. Its totient is φ = 23066880.

The previous prime is 25638913. The next prime is 25638947. The reversal of 25638943 is 34983652.

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 25638943 - 2⁵ = 25638911 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 25638896 and 25638905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25638947) 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, 10948 + ... + 13081.

It is an arithmetic number, because the mean of its divisors is an integer number (3532410).

Almost surely, 2^25638943 is an apocalyptic number.

25638943 is a deficient number, since it is larger than the sum of its proper divisors (2620337).

25638943 is a wasteful number, since it uses less digits than its factorization.

25638943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24137.

The product of its digits is 155520, while the sum is 40.

The square root of 25638943 is about 5063.4911869184. The cubic root of 25638943 is about 294.8718892163.

The spelling of 25638943 in words is "twenty-five million, six hundred thirty-eight thousand, nine hundred forty-three".