26243909 has 4 divisors (see below), whose sum is σ = 26341740. Its totient is φ = 26146080.

The previous prime is 26243891. The next prime is 26243933. The reversal of 26243909 is 90934262.

26243909 = T₂ + T₃ + ... + T₅₃₉.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90934262 = 2 ⋅45467131.

It can be written as a sum of positive squares in 2 ways, for example, as 1493284 + 24750625 = 1222^2 + 4975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26243909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26243509) 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, 48512 + ... + 49049.

It is an arithmetic number, because the mean of its divisors is an integer number (6585435).

Almost surely, 2^26243909 is an apocalyptic number.

It is an amenable number.

26243909 is a deficient number, since it is larger than the sum of its proper divisors (97831).

26243909 is an equidigital number, since it uses as much as digits as its factorization.

26243909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97830.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 26243909 is about 5122.8809277593. The cubic root of 26243909 is about 297.1731089212.

The spelling of 26243909 in words is "twenty-six million, two hundred forty-three thousand, nine hundred nine".