5820821 has 4 divisors (see below), whose sum is σ = 6127200. Its totient is φ = 5514444.

The previous prime is 5820797. The next prime is 5820823. The reversal of 5820821 is 1280285.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1280285 = 5 ⋅256057.

It is a cyclic number.

It is not a de Polignac number, because 5820821 - 2⁶ = 5820757 is a prime.

It is a super-2 number, since 2×5820821² = 67763914228082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5820823) 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 3 ways as a sum of consecutive naturals, for example, 153161 + ... + 153198.

It is an arithmetic number, because the mean of its divisors is an integer number (1531800).

Almost surely, 2^5820821 is an apocalyptic number.

It is an amenable number.

5820821 is a deficient number, since it is larger than the sum of its proper divisors (306379).

5820821 is a wasteful number, since it uses less digits than its factorization.

5820821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306378.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 5820821 is about 2412.6377680870. The cubic root of 5820821 is about 179.8849161482.

The spelling of 5820821 in words is "five million, eight hundred twenty thousand, eight hundred twenty-one".