25240447 has 2 divisors, whose sum is σ = 25240448. Its totient is φ = 25240446.

The previous prime is 25240403. The next prime is 25240483. The reversal of 25240447 is 74404252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25240447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25240847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12620223 + 12620224.

It is an arithmetic number, because the mean of its divisors is an integer number (12620224).

Almost surely, 2^25240447 is an apocalyptic number.

25240447 is a deficient number, since it is larger than the sum of its proper divisors (1).

25240447 is an equidigital number, since it uses as much as digits as its factorization.

25240447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 25240447 is about 5023.9871616078. The cubic root of 25240447 is about 293.3362128103.

Adding to 25240447 its reverse (74404252), we get a palindrome (99644699).

The spelling of 25240447 in words is "twenty-five million, two hundred forty thousand, four hundred forty-seven".