25239839 has 4 divisors (see below), whose sum is σ = 25826856. Its totient is φ = 24652824.

The previous prime is 25239833. The next prime is 25239869. The reversal of 25239839 is 93893252.

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 25239839 - 2⁸ = 25239583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25239796 and 25239805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25239833) 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, 293444 + ... + 293529.

It is an arithmetic number, because the mean of its divisors is an integer number (6456714).

Almost surely, 2^25239839 is an apocalyptic number.

25239839 is a deficient number, since it is larger than the sum of its proper divisors (587017).

25239839 is an equidigital number, since it uses as much as digits as its factorization.

25239839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587016.

The product of its digits is 116640, while the sum is 41.

The square root of 25239839 is about 5023.9266515346. The cubic root of 25239839 is about 293.3338574658. Note that the first 3 decimals are identical.

The spelling of 25239839 in words is "twenty-five million, two hundred thirty-nine thousand, eight hundred thirty-nine".