26138861 has 4 divisors (see below), whose sum is σ = 29872992. Its totient is φ = 22404732.

The previous prime is 26138837. The next prime is 26138867. The reversal of 26138861 is 16883162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26138861 - 2¹⁸ = 25876717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26138867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1867055 + ... + 1867068.

It is an arithmetic number, because the mean of its divisors is an integer number (7468248).

Almost surely, 2^26138861 is an apocalyptic number.

It is an amenable number.

26138861 is a deficient number, since it is larger than the sum of its proper divisors (3734131).

26138861 is an equidigital number, since it uses as much as digits as its factorization.

26138861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734130.

The product of its digits is 13824, while the sum is 35.

The square root of 26138861 is about 5112.6178226032. The cubic root of 26138861 is about 296.7760747552.

The spelling of 26138861 in words is "twenty-six million, one hundred thirty-eight thousand, eight hundred sixty-one".