26871391 has 4 divisors (see below), whose sum is σ = 27007992. Its totient is φ = 26734792.

The previous prime is 26871379. The next prime is 26871401. The reversal of 26871391 is 19317862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26871391 - 2¹⁷ = 26740319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26871391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26871331) 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 3 ways as a sum of consecutive naturals, for example, 68005 + ... + 68398.

It is an arithmetic number, because the mean of its divisors is an integer number (6751998).

Almost surely, 2^26871391 is an apocalyptic number.

26871391 is a deficient number, since it is larger than the sum of its proper divisors (136601).

26871391 is a wasteful number, since it uses less digits than its factorization.

26871391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136600.

The product of its digits is 18144, while the sum is 37.

The square root of 26871391 is about 5183.7622437762. The cubic root of 26871391 is about 299.5229120629.

The spelling of 26871391 in words is "twenty-six million, eight hundred seventy-one thousand, three hundred ninety-one".