25668439 has 4 divisors (see below), whose sum is σ = 26214624. Its totient is φ = 25122256.

The previous prime is 25668427. The next prime is 25668473. The reversal of 25668439 is 93486652.

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 25668439 - 2⁷ = 25668311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25668395 and 25668404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25668499) 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, 273022 + ... + 273115.

It is an arithmetic number, because the mean of its divisors is an integer number (6553656).

Almost surely, 2^25668439 is an apocalyptic number.

25668439 is a deficient number, since it is larger than the sum of its proper divisors (546185).

25668439 is an equidigital number, since it uses as much as digits as its factorization.

25668439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546184.

The product of its digits is 311040, while the sum is 43.

The square root of 25668439 is about 5066.4029646288. The cubic root of 25668439 is about 294.9849231019.

The spelling of 25668439 in words is "twenty-five million, six hundred sixty-eight thousand, four hundred thirty-nine".