25638945 has 8 divisors (see below), whose sum is σ = 41022336. Its totient is φ = 13674096.

The previous prime is 25638913. The next prime is 25638947. The reversal of 25638945 is 54983652.

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

It is not a de Polignac number, because 25638945 - 2⁵ = 25638913 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 25638897 and 25638906.

It is not an unprimeable number, because it can be changed into a prime (25638947) 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, 854617 + ... + 854646.

It is an arithmetic number, because the mean of its divisors is an integer number (5127792).

Almost surely, 2^25638945 is an apocalyptic number.

It is an amenable number.

25638945 is a deficient number, since it is larger than the sum of its proper divisors (15383391).

25638945 is a wasteful number, since it uses less digits than its factorization.

25638945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709271.

The product of its digits is 259200, while the sum is 42.

The square root of 25638945 is about 5063.4913844106. The cubic root of 25638945 is about 294.8718968836.

The spelling of 25638945 in words is "twenty-five million, six hundred thirty-eight thousand, nine hundred forty-five".