26638891 has 2 divisors, whose sum is σ = 26638892. Its totient is φ = 26638890.

The previous prime is 26638841. The next prime is 26638903. The reversal of 26638891 is 19883662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26638891 - 2¹⁵ = 26606123 is a prime.

It is not a weakly prime, because it can be changed into another prime (26638811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13319445 + 13319446.

It is an arithmetic number, because the mean of its divisors is an integer number (13319446).

Almost surely, 2^26638891 is an apocalyptic number.

26638891 is a deficient number, since it is larger than the sum of its proper divisors (1).

26638891 is an equidigital number, since it uses as much as digits as its factorization.

26638891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 26638891 is about 5161.2877269147. The cubic root of 26638891 is about 298.6565520652.

The spelling of 26638891 in words is "twenty-six million, six hundred thirty-eight thousand, eight hundred ninety-one".