26821853 has 2 divisors, whose sum is σ = 26821854. Its totient is φ = 26821852.

The previous prime is 26821829. The next prime is 26821867. The reversal of 26821853 is 35812862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16949689 + 9872164 = 4117^2 + 3142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26821853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26821153) 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, 13410926 + 13410927.

It is an arithmetic number, because the mean of its divisors is an integer number (13410927).

Almost surely, 2^26821853 is an apocalyptic number.

It is an amenable number.

26821853 is a deficient number, since it is larger than the sum of its proper divisors (1).

26821853 is an equidigital number, since it uses as much as digits as its factorization.

26821853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 26821853 is about 5178.9818497461. The cubic root of 26821853 is about 299.3387398171.

The spelling of 26821853 in words is "twenty-six million, eight hundred twenty-one thousand, eight hundred fifty-three".