25907639 has 2 divisors, whose sum is σ = 25907640. Its totient is φ = 25907638.

The previous prime is 25907617. The next prime is 25907641. The reversal of 25907639 is 93670952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25907639 - 2²⁴ = 9130423 is a prime.

It is a Sophie Germain prime.

Together with 25907641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25907596 and 25907605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25907239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12953819 + 12953820.

It is an arithmetic number, because the mean of its divisors is an integer number (12953820).

Almost surely, 2^25907639 is an apocalyptic number.

25907639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25907639 is an equidigital number, since it uses as much as digits as its factorization.

25907639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 25907639 is about 5089.9547149263. The cubic root of 25907639 is about 295.8983969216.

The spelling of 25907639 in words is "twenty-five million, nine hundred seven thousand, six hundred thirty-nine".