26806391 has 4 divisors (see below), whose sum is σ = 26878632. Its totient is φ = 26734152.

The previous prime is 26806361. The next prime is 26806453. The reversal of 26806391 is 19360862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19360862 = 2 ⋅9680431.

It is a cyclic number.

It is not a de Polignac number, because 26806391 - 2⁶ = 26806327 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 (26806301) 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, 35561 + ... + 36306.

It is an arithmetic number, because the mean of its divisors is an integer number (6719658).

Almost surely, 2^26806391 is an apocalyptic number.

26806391 is a deficient number, since it is larger than the sum of its proper divisors (72241).

26806391 is an equidigital number, since it uses as much as digits as its factorization.

26806391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72240.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 26806391 is about 5177.4888700991. The cubic root of 26806391 is about 299.2812088025.

The spelling of 26806391 in words is "twenty-six million, eight hundred six thousand, three hundred ninety-one".