26856257 has 2 divisors, whose sum is σ = 26856258. Its totient is φ = 26856256.

The previous prime is 26856239. The next prime is 26856289. The reversal of 26856257 is 75265862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 8202496 = 4319^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 26856257 - 2¹⁰ = 26855233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26856217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13428128 + 13428129.

It is an arithmetic number, because the mean of its divisors is an integer number (13428129).

Almost surely, 2^26856257 is an apocalyptic number.

It is an amenable number.

26856257 is a deficient number, since it is larger than the sum of its proper divisors (1).

26856257 is an equidigital number, since it uses as much as digits as its factorization.

26856257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 41.

The square root of 26856257 is about 5182.3022875938. The cubic root of 26856257 is about 299.4666709474.

The spelling of 26856257 in words is "twenty-six million, eight hundred fifty-six thousand, two hundred fifty-seven".