25630439 has 2 divisors, whose sum is σ = 25630440. Its totient is φ = 25630438.

The previous prime is 25630433. The next prime is 25630457. The reversal of 25630439 is 93403652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25630439 - 2²⁰ = 24581863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25630433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12815219 + 12815220.

It is an arithmetic number, because the mean of its divisors is an integer number (12815220).

Almost surely, 2^25630439 is an apocalyptic number.

25630439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25630439 is an equidigital number, since it uses as much as digits as its factorization.

25630439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 25630439 is about 5062.6513804527. The cubic root of 25630439 is about 294.8392842862.

The spelling of 25630439 in words is "twenty-five million, six hundred thirty thousand, four hundred thirty-nine".