25820839 has 8 divisors (see below), whose sum is σ = 28418832. Its totient is φ = 23264640.

The previous prime is 25820777. The next prime is 25820887. The reversal of 25820839 is 93802852.

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 25820839 - 2²³ = 17432231 is a prime.

It is a super-3 number, since 3×25820839³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25820798 and 25820807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820539) 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, 9144 + ... + 11629.

It is an arithmetic number, because the mean of its divisors is an integer number (3552354).

Almost surely, 2^25820839 is an apocalyptic number.

25820839 is a deficient number, since it is larger than the sum of its proper divisors (2597993).

25820839 is a wasteful number, since it uses less digits than its factorization.

25820839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20897.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 25820839 is about 5081.4209626836. The cubic root of 25820839 is about 295.5675714855.

The spelling of 25820839 in words is "twenty-five million, eight hundred twenty thousand, eight hundred thirty-nine".