3833821 has 4 divisors (see below), whose sum is σ = 3840444. Its totient is φ = 3827200.

The previous prime is 3833777. The next prime is 3833833. The reversal of 3833821 is 1283383.

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 1625625 + 2208196 = 1275^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 3833821 - 2¹⁵ = 3801053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3833821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3833881) 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, 2350 + ... + 3631.

It is an arithmetic number, because the mean of its divisors is an integer number (960111).

Almost surely, 2^3833821 is an apocalyptic number.

It is an amenable number.

3833821 is a deficient number, since it is larger than the sum of its proper divisors (6623).

3833821 is an equidigital number, since it uses as much as digits as its factorization.

3833821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622.

The product of its digits is 3456, while the sum is 28.

The square root of 3833821 is about 1958.0145556149. The cubic root of 3833821 is about 156.5106676135.

It can be divided in two parts, 383382 and 1, that added together give a palindrome (383383).

The spelling of 3833821 in words is "three million, eight hundred thirty-three thousand, eight hundred twenty-one".