25986139 has 2 divisors, whose sum is σ = 25986140. Its totient is φ = 25986138.

The previous prime is 25986133. The next prime is 25986143. The reversal of 25986139 is 93168952.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25986139 - 2⁷ = 25986011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25986095 and 25986104.

It is not a weakly prime, because it can be changed into another prime (25986133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12993069 + 12993070.

It is an arithmetic number, because the mean of its divisors is an integer number (12993070).

Almost surely, 2^25986139 is an apocalyptic number.

25986139 is a deficient number, since it is larger than the sum of its proper divisors (1).

25986139 is an equidigital number, since it uses as much as digits as its factorization.

25986139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 25986139 is about 5097.6601495196. The cubic root of 25986139 is about 296.1969524083.

The spelling of 25986139 in words is "twenty-five million, nine hundred eighty-six thousand, one hundred thirty-nine".