26530209 has 6 divisors (see below), whose sum is σ = 38321426. Its totient is φ = 17686800.

The previous prime is 26530199. The next prime is 26530211. The reversal of 26530209 is 90203562.

26530209 is a `hidden beast` number, since 2 + 653 + 0 + 2 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 2471184 = 4905^2 + 1572^2 .

It is not a de Polignac number, because 26530209 - 2⁵ = 26530177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26530219) 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 5 ways as a sum of consecutive naturals, for example, 1473892 + ... + 1473909.

Almost surely, 2^26530209 is an apocalyptic number.

It is an amenable number.

26530209 is a deficient number, since it is larger than the sum of its proper divisors (11791217).

26530209 is a wasteful number, since it uses less digits than its factorization.

26530209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947807 (or 2947804 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 26530209 is about 5150.7483922242. The cubic root of 26530209 is about 298.2498430234.

The spelling of 26530209 in words is "twenty-six million, five hundred thirty thousand, two hundred nine".