26821439 has 2 divisors, whose sum is σ = 26821440. Its totient is φ = 26821438.

The previous prime is 26821321. The next prime is 26821453. The reversal of 26821439 is 93412862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26821439 - 2²⁰ = 25772863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26821399 and 26821408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26821499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13410719 + 13410720.

It is an arithmetic number, because the mean of its divisors is an integer number (13410720).

Almost surely, 2^26821439 is an apocalyptic number.

26821439 is a deficient number, since it is larger than the sum of its proper divisors (1).

26821439 is an equidigital number, since it uses as much as digits as its factorization.

26821439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 26821439 is about 5178.9418803458. The cubic root of 26821439 is about 299.3371996939.

The spelling of 26821439 in words is "twenty-six million, eight hundred twenty-one thousand, four hundred thirty-nine".