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26905 = 55381

26905 has 4 divisors (see below), whose sum is σ = 32292. Its totient is φ = 21520.

The previous prime is 26903. The next prime is 26921. The reversal of 26905 is 50962.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9216 + 17689 = 96^2 + 133^2 .

It is not a de Polignac number, because 26905 - 21 = 26903 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

26905 is a lucky number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (26903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2686 + ... + 2695.

It is an arithmetic number, because the mean of its divisors is an integer number (8073).

226905 is an apocalyptic number.

It is an amenable number.

26905 is a deficient number, since it is larger than the sum of its proper divisors (5387).

26905 is an equidigital number, since it uses as much as digits as its factorization.

26905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5386.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 26905 is about 164.0274367293. The cubic root of 26905 is about 29.9647734674.

The spelling of 26905 in words is "twenty-six thousand, nine hundred five".

Divisors: 1 5 5381 26905