26243209 has 4 divisors (see below), whose sum is σ = 26380800. Its totient is φ = 26105620.

The previous prime is 26243183. The next prime is 26243219. The reversal of 26243209 is 90234262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26243209 - 2¹¹ = 26241161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26243219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68509 + ... + 68890.

It is an arithmetic number, because the mean of its divisors is an integer number (6595200).

Almost surely, 2^26243209 is an apocalyptic number.

It is an amenable number.

26243209 is a deficient number, since it is larger than the sum of its proper divisors (137591).

26243209 is a wasteful number, since it uses less digits than its factorization.

26243209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137590.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 26243209 is about 5122.8126063716. The cubic root of 26243209 is about 297.1704667459.

The spelling of 26243209 in words is "twenty-six million, two hundred forty-three thousand, two hundred nine".