25847839 has 4 divisors (see below), whose sum is σ = 25983360. Its totient is φ = 25712320.

The previous prime is 25847827. The next prime is 25847849. The reversal of 25847839 is 93874852.

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 25847839 - 2⁵ = 25847807 is a prime.

It is a super-2 number, since 2×25847839² = 1336221561939842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25847849) 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, 67474 + ... + 67855.

It is an arithmetic number, because the mean of its divisors is an integer number (6495840).

Almost surely, 2^25847839 is an apocalyptic number.

25847839 is a deficient number, since it is larger than the sum of its proper divisors (135521).

25847839 is a wasteful number, since it uses less digits than its factorization.

25847839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135520.

The product of its digits is 483840, while the sum is 46.

The square root of 25847839 is about 5084.0770057111. The cubic root of 25847839 is about 295.6705573523.

The spelling of 25847839 in words is "twenty-five million, eight hundred forty-seven thousand, eight hundred thirty-nine".