26865821 has 2 divisors, whose sum is σ = 26865822. Its totient is φ = 26865820.

The previous prime is 26865779. The next prime is 26865833. The reversal of 26865821 is 12856862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 4644025 = 4714^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 26865821 - 2¹⁴ = 26849437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26865721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13432910 + 13432911.

It is an arithmetic number, because the mean of its divisors is an integer number (13432911).

Almost surely, 2^26865821 is an apocalyptic number.

It is an amenable number.

26865821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26865821 is an equidigital number, since it uses as much as digits as its factorization.

26865821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 26865821 is about 5183.2249613537. The cubic root of 26865821 is about 299.5022152320.

The spelling of 26865821 in words is "twenty-six million, eight hundred sixty-five thousand, eight hundred twenty-one".