25785139 has 4 divisors (see below), whose sum is σ = 26906256. Its totient is φ = 24664024.

The previous prime is 25785121. The next prime is 25785161. The reversal of 25785139 is 93158752.

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 25785139 - 2¹¹ = 25783091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25785119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560524 + ... + 560569.

It is an arithmetic number, because the mean of its divisors is an integer number (6726564).

Almost surely, 2^25785139 is an apocalyptic number.

25785139 is a deficient number, since it is larger than the sum of its proper divisors (1121117).

25785139 is a wasteful number, since it uses less digits than its factorization.

25785139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121116.

The product of its digits is 75600, while the sum is 40.

The square root of 25785139 is about 5077.9069507032. The cubic root of 25785139 is about 295.4312910053.

The spelling of 25785139 in words is "twenty-five million, seven hundred eighty-five thousand, one hundred thirty-nine".