25868639 has 4 divisors (see below), whose sum is σ = 26135424. Its totient is φ = 25601856.

The previous prime is 25868621. The next prime is 25868653. The reversal of 25868639 is 93686852.

It is a happy number.

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 25868639 - 2⁸ = 25868383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25868593 and 25868602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25868839) 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, 133247 + ... + 133440.

It is an arithmetic number, because the mean of its divisors is an integer number (6533856).

Almost surely, 2^25868639 is an apocalyptic number.

25868639 is a deficient number, since it is larger than the sum of its proper divisors (266785).

25868639 is an equidigital number, since it uses as much as digits as its factorization.

25868639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266784.

The product of its digits is 622080, while the sum is 47.

The square root of 25868639 is about 5086.1221967232. The cubic root of 25868639 is about 295.7498457174.

The spelling of 25868639 in words is "twenty-five million, eight hundred sixty-eight thousand, six hundred thirty-nine".