26405009 has 4 divisors (see below), whose sum is σ = 26837940. Its totient is φ = 25972080.

The previous prime is 26404999. The next prime is 26405011. The reversal of 26405009 is 90050462.

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 13104400 + 13300609 = 3620^2 + 3647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26405009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26405059) 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 3 ways as a sum of consecutive naturals, for example, 216374 + ... + 216495.

It is an arithmetic number, because the mean of its divisors is an integer number (6709485).

Almost surely, 2^26405009 is an apocalyptic number.

It is an amenable number.

26405009 is a deficient number, since it is larger than the sum of its proper divisors (432931).

26405009 is an equidigital number, since it uses as much as digits as its factorization.

26405009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432930.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 26405009 is about 5138.5804459987. The cubic root of 26405009 is about 297.7799412863.

The spelling of 26405009 in words is "twenty-six million, four hundred five thousand, nine".