26856391 has 2 divisors, whose sum is σ = 26856392. Its totient is φ = 26856390.

The previous prime is 26856383. The next prime is 26856397. The reversal of 26856391 is 19365862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26856391 - 2³ = 26856383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26856397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13428195 + 13428196.

It is an arithmetic number, because the mean of its divisors is an integer number (13428196).

Almost surely, 2^26856391 is an apocalyptic number.

26856391 is a deficient number, since it is larger than the sum of its proper divisors (1).

26856391 is an equidigital number, since it uses as much as digits as its factorization.

26856391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 26856391 is about 5182.3152161944. The cubic root of 26856391 is about 299.4671690122.

The spelling of 26856391 in words is "twenty-six million, eight hundred fifty-six thousand, three hundred ninety-one".