25138847 has 4 divisors (see below), whose sum is σ = 25270656. Its totient is φ = 25007040.

The previous prime is 25138837. The next prime is 25138849. The reversal of 25138847 is 74883152.

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

It is a cyclic number.

It is not a de Polignac number, because 25138847 - 2⁶ = 25138783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25138847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65618 + ... + 65999.

It is an arithmetic number, because the mean of its divisors is an integer number (6317664).

Almost surely, 2^25138847 is an apocalyptic number.

25138847 is a deficient number, since it is larger than the sum of its proper divisors (131809).

25138847 is a wasteful number, since it uses less digits than its factorization.

25138847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131808.

The product of its digits is 53760, while the sum is 38.

The square root of 25138847 is about 5013.8654748607. The cubic root of 25138847 is about 292.9420962117.

The spelling of 25138847 in words is "twenty-five million, one hundred thirty-eight thousand, eight hundred forty-seven".