25957993 has 2 divisors, whose sum is σ = 25957994. Its totient is φ = 25957992.

The previous prime is 25957991. The next prime is 25957999. The reversal of 25957993 is 39975952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25836889 + 121104 = 5083^2 + 348^2 .

It is a cyclic number.

It is not a de Polignac number, because 25957993 - 2¹ = 25957991 is a prime.

Together with 25957991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25957991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12978996 + 12978997.

It is an arithmetic number, because the mean of its divisors is an integer number (12978997).

Almost surely, 2^25957993 is an apocalyptic number.

It is an amenable number.

25957993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25957993 is an equidigital number, since it uses as much as digits as its factorization.

25957993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 765450, while the sum is 49.

The square root of 25957993 is about 5094.8987232329. The cubic root of 25957993 is about 296.0899752345.

The spelling of 25957993 in words is "twenty-five million, nine hundred fifty-seven thousand, nine hundred ninety-three".