26808921 has 8 divisors (see below), whose sum is σ = 39716960. Its totient is φ = 17872596.

The previous prime is 26808913. The next prime is 26808923. The reversal of 26808921 is 12980862.

It is not a de Polignac number, because 26808921 - 2³ = 26808913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26808923) 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 in 7 ways as a sum of consecutive naturals, for example, 496435 + ... + 496488.

It is an arithmetic number, because the mean of its divisors is an integer number (4964620).

Almost surely, 2^26808921 is an apocalyptic number.

It is an amenable number.

26808921 is a deficient number, since it is larger than the sum of its proper divisors (12908039).

26808921 is an equidigital number, since it uses as much as digits as its factorization.

26808921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992932 (or 992926 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 26808921 is about 5177.7331912720. The cubic root of 26808921 is about 299.2906239408.

The spelling of 26808921 in words is "twenty-six million, eight hundred eight thousand, nine hundred twenty-one".