26857231 has 4 divisors (see below), whose sum is σ = 26886832. Its totient is φ = 26827632.

The previous prime is 26857217. The next prime is 26857249. The reversal of 26857231 is 13275862.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13275862 = 2 ⋅6637931.

It is a cyclic number.

It is not a de Polignac number, because 26857231 - 2⁵ = 26857199 is a prime.

It is a super-2 number, since 2×26857231² = 1442621713974722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26857291) 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, 13395 + ... + 15268.

It is an arithmetic number, because the mean of its divisors is an integer number (6721708).

Almost surely, 2^26857231 is an apocalyptic number.

26857231 is a deficient number, since it is larger than the sum of its proper divisors (29601).

26857231 is an equidigital number, since it uses as much as digits as its factorization.

26857231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29600.

The product of its digits is 20160, while the sum is 34.

The square root of 26857231 is about 5182.3962604185. The cubic root of 26857231 is about 299.4702911716.

The spelling of 26857231 in words is "twenty-six million, eight hundred fifty-seven thousand, two hundred thirty-one".