26397857 has 4 divisors (see below), whose sum is σ = 26556096. Its totient is φ = 26239620.

The previous prime is 26397827. The next prime is 26397887. The reversal of 26397857 is 75879362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (26397827) and next prime (26397887).

It is a cyclic number.

It is not a de Polignac number, because 26397857 - 2⁶ = 26397793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26397827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78869 + ... + 79202.

It is an arithmetic number, because the mean of its divisors is an integer number (6639024).

Almost surely, 2^26397857 is an apocalyptic number.

It is an amenable number.

26397857 is a deficient number, since it is larger than the sum of its proper divisors (158239).

26397857 is a wasteful number, since it uses less digits than its factorization.

26397857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158238.

The product of its digits is 635040, while the sum is 47.

The square root of 26397857 is about 5137.8844868292. The cubic root of 26397857 is about 297.7530535286.

The spelling of 26397857 in words is "twenty-six million, three hundred ninety-seven thousand, eight hundred fifty-seven".