5709821 has 4 divisors (see below), whose sum is σ = 6149052. Its totient is φ = 5270592.

The previous prime is 5709817. The next prime is 5709857. The reversal of 5709821 is 1289075.

5709821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 931225 + 4778596 = 965^2 + 2186^2 .

It is a cyclic number.

It is not a de Polignac number, because 5709821 - 2² = 5709817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5709811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219596 + ... + 219621.

It is an arithmetic number, because the mean of its divisors is an integer number (1537263).

Almost surely, 2^5709821 is an apocalyptic number.

It is an amenable number.

5709821 is a deficient number, since it is larger than the sum of its proper divisors (439231).

5709821 is a wasteful number, since it uses less digits than its factorization.

5709821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439230.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 5709821 is about 2389.5231741919. The cubic root of 5709821 is about 178.7341329421.

The spelling of 5709821 in words is "five million, seven hundred nine thousand, eight hundred twenty-one".