26391897 has 24 divisors (see below), whose sum is σ = 43767360. Its totient is φ = 15012000.

The previous prime is 26391889. The next prime is 26391899. The reversal of 26391897 is 79819362.

26391897 is a `hidden beast` number, since 2 + 639 + 1 + 8 + 9 + 7 = 666.

It is not a de Polignac number, because 26391897 - 2³ = 26391889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26391899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14979 + ... + 16647.

It is an arithmetic number, because the mean of its divisors is an integer number (1823640).

Almost surely, 2^26391897 is an apocalyptic number.

It is an amenable number.

26391897 is a deficient number, since it is larger than the sum of its proper divisors (17375463).

26391897 is a wasteful number, since it uses less digits than its factorization.

26391897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933 (or 1930 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 26391897 is about 5137.3044488331. The cubic root of 26391897 is about 297.7306433537.

The spelling of 26391897 in words is "twenty-six million, three hundred ninety-one thousand, eight hundred ninety-seven".