26398769 has 2 divisors, whose sum is σ = 26398770. Its totient is φ = 26398768.

The previous prime is 26398753. The next prime is 26398781. The reversal of 26398769 is 96789362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26388769 + 10000 = 5137^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 26398769 - 2⁴ = 26398753 is a prime.

It is a super-2 number, since 2×26398769² = 1393790009430722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26398069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199384 + 13199385.

It is an arithmetic number, because the mean of its divisors is an integer number (13199385).

Almost surely, 2^26398769 is an apocalyptic number.

It is an amenable number.

26398769 is a deficient number, since it is larger than the sum of its proper divisors (1).

26398769 is an equidigital number, since it uses as much as digits as its factorization.

26398769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 26398769 is about 5137.9732385446. The cubic root of 26398769 is about 297.7564824389.

The spelling of 26398769 in words is "twenty-six million, three hundred ninety-eight thousand, seven hundred sixty-nine".