26684813 has 2 divisors, whose sum is σ = 26684814. Its totient is φ = 26684812.

The previous prime is 26684789. The next prime is 26684821. The reversal of 26684813 is 31848662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14273284 + 12411529 = 3778^2 + 3523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26684813 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26684863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13342406 + 13342407.

It is an arithmetic number, because the mean of its divisors is an integer number (13342407).

Almost surely, 2^26684813 is an apocalyptic number.

It is an amenable number.

26684813 is a deficient number, since it is larger than the sum of its proper divisors (1).

26684813 is an equidigital number, since it uses as much as digits as its factorization.

26684813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 26684813 is about 5165.7345073087. The cubic root of 26684813 is about 298.8280686249.

The spelling of 26684813 in words is "twenty-six million, six hundred eighty-four thousand, eight hundred thirteen".