26856931 has 4 divisors (see below), whose sum is σ = 27582832. Its totient is φ = 26131032.

The previous prime is 26856917. The next prime is 26856953. The reversal of 26856931 is 13965862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26856931 - 2¹⁵ = 26824163 is a prime.

It is a super-2 number, since 2×26856931² = 1442589485477522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26856901) 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, 362895 + ... + 362968.

It is an arithmetic number, because the mean of its divisors is an integer number (6895708).

Almost surely, 2^26856931 is an apocalyptic number.

26856931 is a deficient number, since it is larger than the sum of its proper divisors (725901).

26856931 is an equidigital number, since it uses as much as digits as its factorization.

26856931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725900.

The product of its digits is 77760, while the sum is 40.

The square root of 26856931 is about 5182.3673161983. The cubic root of 26856931 is about 299.4691761222.

The spelling of 26856931 in words is "twenty-six million, eight hundred fifty-six thousand, nine hundred thirty-one".