25657439 has 2 divisors, whose sum is σ = 25657440. Its totient is φ = 25657438.

The previous prime is 25657427. The next prime is 25657451. The reversal of 25657439 is 93475652.

It is a balanced prime because it is at equal distance from previous prime (25657427) and next prime (25657451).

It is a cyclic number.

It is not a de Polignac number, because 25657439 - 2¹² = 25653343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25657396 and 25657405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25657409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828719 + 12828720.

It is an arithmetic number, because the mean of its divisors is an integer number (12828720).

Almost surely, 2^25657439 is an apocalyptic number.

25657439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25657439 is an equidigital number, since it uses as much as digits as its factorization.

25657439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 25657439 is about 5065.3172654830. The cubic root of 25657439 is about 294.9427792876.

The spelling of 25657439 in words is "twenty-five million, six hundred fifty-seven thousand, four hundred thirty-nine".