26137891 has 16 divisors (see below), whose sum is σ = 30125088. Its totient is φ = 22464000.

The previous prime is 26137889. The next prime is 26137897. The reversal of 26137891 is 19873162.

It is not a de Polignac number, because 26137891 - 2¹ = 26137889 is a prime.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 26137891.

It is not an unprimeable number, because it can be changed into a prime (26137897) 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 15 ways as a sum of consecutive naturals, for example, 21736 + ... + 22906.

It is an arithmetic number, because the mean of its divisors is an integer number (1882818).

Almost surely, 2^26137891 is an apocalyptic number.

26137891 is a deficient number, since it is larger than the sum of its proper divisors (3987197).

26137891 is a wasteful number, since it uses less digits than its factorization.

26137891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

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

The square root of 26137891 is about 5112.5229583837. The cubic root of 26137891 is about 296.7724036395.

It can be divided in two parts, 26137 and 891, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 26137891 in words is "twenty-six million, one hundred thirty-seven thousand, eight hundred ninety-one".