25242839 has 4 divisors (see below), whose sum is σ = 25858560. Its totient is φ = 24627120.

The previous prime is 25242827. The next prime is 25242857. The reversal of 25242839 is 93824252.

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 25242839 - 2⁴ = 25242823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25242799 and 25242808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25242809) 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, 307799 + ... + 307880.

It is an arithmetic number, because the mean of its divisors is an integer number (6464640).

Almost surely, 2^25242839 is an apocalyptic number.

25242839 is a deficient number, since it is larger than the sum of its proper divisors (615721).

25242839 is an equidigital number, since it uses as much as digits as its factorization.

25242839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615720.

The product of its digits is 34560, while the sum is 35.

The square root of 25242839 is about 5024.2252139011. The cubic root of 25242839 is about 293.3454788646.

The spelling of 25242839 in words is "twenty-five million, two hundred forty-two thousand, eight hundred thirty-nine".