25656139 has 8 divisors (see below), whose sum is σ = 26008128. Its totient is φ = 25306440.

The previous prime is 25656131. The next prime is 25656157. The reversal of 25656139 is 93165652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25656139 - 2³ = 25656131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25656098 and 25656107.

It is not an unprimeable number, because it can be changed into a prime (25656131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36784 + ... + 37474.

It is an arithmetic number, because the mean of its divisors is an integer number (3251016).

Almost surely, 2^25656139 is an apocalyptic number.

25656139 is a deficient number, since it is larger than the sum of its proper divisors (351989).

25656139 is a wasteful number, since it uses less digits than its factorization.

25656139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145.

The product of its digits is 48600, while the sum is 37.

The square root of 25656139 is about 5065.1889402075. The cubic root of 25656139 is about 294.9377978592.

The spelling of 25656139 in words is "twenty-five million, six hundred fifty-six thousand, one hundred thirty-nine".