3858821 has 4 divisors (see below), whose sum is σ = 3867552. Its totient is φ = 3850092.

The previous prime is 3858817. The next prime is 3858839. The reversal of 3858821 is 1288583.

3858821 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3858821 - 2² = 3858817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3858851) 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, 3665 + ... + 4598.

It is an arithmetic number, because the mean of its divisors is an integer number (966888).

Almost surely, 2^3858821 is an apocalyptic number.

It is an amenable number.

3858821 is a deficient number, since it is larger than the sum of its proper divisors (8731).

3858821 is an equidigital number, since it uses as much as digits as its factorization.

3858821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730.

The product of its digits is 15360, while the sum is 35.

The square root of 3858821 is about 1964.3881999238. The cubic root of 3858821 is about 156.8501281183.

The spelling of 3858821 in words is "three million, eight hundred fifty-eight thousand, eight hundred twenty-one".