26138839 has 4 divisors (see below), whose sum is σ = 26155656. Its totient is φ = 26122024.

The previous prime is 26138837. The next prime is 26138867. The reversal of 26138839 is 93883162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93883162 = 2 ⋅46941581.

It is a cyclic number.

It is not a de Polignac number, because 26138839 - 2¹ = 26138837 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 (26138837) 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, 5809 + ... + 9274.

It is an arithmetic number, because the mean of its divisors is an integer number (6538914).

Almost surely, 2^26138839 is an apocalyptic number.

26138839 is a deficient number, since it is larger than the sum of its proper divisors (16817).

26138839 is a wasteful number, since it uses less digits than its factorization.

26138839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16816.

The product of its digits is 62208, while the sum is 40.

The square root of 26138839 is about 5112.6156710631. The cubic root of 26138839 is about 296.7759914938.

The spelling of 26138839 in words is "twenty-six million, one hundred thirty-eight thousand, eight hundred thirty-nine".