26138587 has 2 divisors, whose sum is σ = 26138588. Its totient is φ = 26138586.

The previous prime is 26138573. The next prime is 26138633. The reversal of 26138587 is 78583162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26138587 - 2¹⁵ = 26105819 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26138507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13069293 + 13069294.

It is an arithmetic number, because the mean of its divisors is an integer number (13069294).

Almost surely, 2^26138587 is an apocalyptic number.

26138587 is a deficient number, since it is larger than the sum of its proper divisors (1).

26138587 is an equidigital number, since it uses as much as digits as its factorization.

26138587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 26138587 is about 5112.5910260845. The cubic root of 26138587 is about 296.7750377688.

The spelling of 26138587 in words is "twenty-six million, one hundred thirty-eight thousand, five hundred eighty-seven".