25787947 has 2 divisors, whose sum is σ = 25787948. Its totient is φ = 25787946.

The previous prime is 25787903. The next prime is 25787953. The reversal of 25787947 is 74978752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25787947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25787947.

It is not a weakly prime, because it can be changed into another prime (25787747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12893973 + 12893974.

It is an arithmetic number, because the mean of its divisors is an integer number (12893974).

Almost surely, 2^25787947 is an apocalyptic number.

25787947 is a deficient number, since it is larger than the sum of its proper divisors (1).

25787947 is an equidigital number, since it uses as much as digits as its factorization.

25787947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 25787947 is about 5078.1834350484. The cubic root of 25787947 is about 295.4420147657.

The spelling of 25787947 in words is "twenty-five million, seven hundred eighty-seven thousand, nine hundred forty-seven".