26990209 has 2 divisors, whose sum is σ = 26990210. Its totient is φ = 26990208.

The previous prime is 26990207. The next prime is 26990219. The reversal of 26990209 is 90209962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 4928400 = 4697^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 26990209 - 2¹ = 26990207 is a prime.

Together with 26990207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26990207) 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, 13495104 + 13495105.

It is an arithmetic number, because the mean of its divisors is an integer number (13495105).

Almost surely, 2^26990209 is an apocalyptic number.

It is an amenable number.

26990209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26990209 is an equidigital number, since it uses as much as digits as its factorization.

26990209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 26990209 is about 5195.2101978650. The cubic root of 26990209 is about 299.9637326528.

The spelling of 26990209 in words is "twenty-six million, nine hundred ninety thousand, two hundred nine".