25905839 has 4 divisors (see below), whose sum is σ = 26157456. Its totient is φ = 25654224.

The previous prime is 25905821. The next prime is 25905851. The reversal of 25905839 is 93850952.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25905839 is a prime.

It is a super-2 number, since 2×25905839² = 1342224988587842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25905796 and 25905805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25905899) 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, 125654 + ... + 125859.

It is an arithmetic number, because the mean of its divisors is an integer number (6539364).

Almost surely, 2^25905839 is an apocalyptic number.

25905839 is a deficient number, since it is larger than the sum of its proper divisors (251617).

25905839 is a wasteful number, since it uses less digits than its factorization.

25905839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251616.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 25905839 is about 5089.7778929930. Note that the first 3 decimals coincide. The cubic root of 25905839 is about 295.8915439950.

The spelling of 25905839 in words is "twenty-five million, nine hundred five thousand, eight hundred thirty-nine".