26490257 has 2 divisors, whose sum is σ = 26490258. Its totient is φ = 26490256.

The previous prime is 26490241. The next prime is 26490293. The reversal of 26490257 is 75209462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16192576 + 10297681 = 4024^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 26490257 - 2⁴ = 26490241 is a prime.

It is a Chen prime.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (26490157) 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, 13245128 + 13245129.

It is an arithmetic number, because the mean of its divisors is an integer number (13245129).

Almost surely, 2^26490257 is an apocalyptic number.

It is an amenable number.

26490257 is a deficient number, since it is larger than the sum of its proper divisors (1).

26490257 is an equidigital number, since it uses as much as digits as its factorization.

26490257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 26490257 is about 5146.8686596804. The cubic root of 26490257 is about 298.1000557371.

The spelling of 26490257 in words is "twenty-six million, four hundred ninety thousand, two hundred fifty-seven".