26821449 has 20 divisors (see below), whose sum is σ = 40375764. Its totient is φ = 17743104.

The previous prime is 26821439. The next prime is 26821453. The reversal of 26821449 is 94412862.

It can be written as a sum of positive squares in 2 ways, for example, as 22155849 + 4665600 = 4707^2 + 2160^2 .

It is not a de Polignac number, because 26821449 - 2⁷ = 26821321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26821439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9889 + ... + 12305.

Almost surely, 2^26821449 is an apocalyptic number.

It is an amenable number.

26821449 is a deficient number, since it is larger than the sum of its proper divisors (13554315).

26821449 is a wasteful number, since it uses less digits than its factorization.

26821449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566 (or 2557 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 26821449 is about 5178.9428457939. The cubic root of 26821449 is about 299.3372368951.

The spelling of 26821449 in words is "twenty-six million, eight hundred twenty-one thousand, four hundred forty-nine".