26864209 has 2 divisors, whose sum is σ = 26864210. Its totient is φ = 26864208.

The previous prime is 26864203. The next prime is 26864231. The reversal of 26864209 is 90246862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18249984 + 8614225 = 4272^2 + 2935^2 .

It is a cyclic number.

It is not a de Polignac number, because 26864209 - 2⁵ = 26864177 is a prime.

It is not a weakly prime, because it can be changed into another prime (26864203) 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, 13432104 + 13432105.

It is an arithmetic number, because the mean of its divisors is an integer number (13432105).

Almost surely, 2^26864209 is an apocalyptic number.

It is an amenable number.

26864209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26864209 is an equidigital number, since it uses as much as digits as its factorization.

26864209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 26864209 is about 5183.0694573775. The cubic root of 26864209 is about 299.4962248793.

The spelling of 26864209 in words is "twenty-six million, eight hundred sixty-four thousand, two hundred nine".