26694809 has 2 divisors, whose sum is σ = 26694810. Its totient is φ = 26694808.

The previous prime is 26694803. The next prime is 26694823. The reversal of 26694809 is 90849662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24720784 + 1974025 = 4972^2 + 1405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26694809 is a prime.

It is a super-2 number, since 2×26694809² = 1425225655092962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26694809.

It is not a weakly prime, because it can be changed into another prime (26694803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13347404 + 13347405.

It is an arithmetic number, because the mean of its divisors is an integer number (13347405).

Almost surely, 2^26694809 is an apocalyptic number.

It is an amenable number.

26694809 is a deficient number, since it is larger than the sum of its proper divisors (1).

26694809 is an equidigital number, since it uses as much as digits as its factorization.

26694809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 26694809 is about 5166.7019461161. The cubic root of 26694809 is about 298.8653771428.

The spelling of 26694809 in words is "twenty-six million, six hundred ninety-four thousand, eight hundred nine".