26897917 has 2 divisors, whose sum is σ = 26897918. Its totient is φ = 26897916.

The previous prime is 26897903. The next prime is 26897921. The reversal of 26897917 is 71979862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20169081 + 6728836 = 4491^2 + 2594^2 .

It is a cyclic number.

It is not a de Polignac number, because 26897917 - 2¹⁵ = 26865149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26897947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13448958 + 13448959.

It is an arithmetic number, because the mean of its divisors is an integer number (13448959).

Almost surely, 2^26897917 is an apocalyptic number.

It is an amenable number.

26897917 is a deficient number, since it is larger than the sum of its proper divisors (1).

26897917 is an equidigital number, since it uses as much as digits as its factorization.

26897917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 26897917 is about 5186.3201790865. The cubic root of 26897917 is about 299.6214373167.

The spelling of 26897917 in words is "twenty-six million, eight hundred ninety-seven thousand, nine hundred seventeen".