25297439 has 2 divisors, whose sum is σ = 25297440. Its totient is φ = 25297438.

The previous prime is 25297429. The next prime is 25297471. The reversal of 25297439 is 93479252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25297439 - 2⁸ = 25297183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25297396 and 25297405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25297409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12648719 + 12648720.

It is an arithmetic number, because the mean of its divisors is an integer number (12648720).

Almost surely, 2^25297439 is an apocalyptic number.

25297439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25297439 is an equidigital number, since it uses as much as digits as its factorization.

25297439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 25297439 is about 5029.6559524484. The cubic root of 25297439 is about 293.5568276363.

The spelling of 25297439 in words is "twenty-five million, two hundred ninety-seven thousand, four hundred thirty-nine".