3830821 has 8 divisors (see below), whose sum is σ = 3930584. Its totient is φ = 3732480.

The previous prime is 3830819. The next prime is 3830843. The reversal of 3830821 is 1280383.

3830821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 448900 + 3381921 = 670^2 + 1839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(3830821) divides (3830821-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 3830821 - 2¹ = 3830819 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 (3830881) 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 7 ways as a sum of consecutive naturals, for example, 6811 + ... + 7351.

It is an arithmetic number, because the mean of its divisors is an integer number (491323).

Almost surely, 2^3830821 is an apocalyptic number.

It is an amenable number.

3830821 is a deficient number, since it is larger than the sum of its proper divisors (99763).

3830821 is an equidigital number, since it uses as much as digits as its factorization.

3830821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 3830821 is about 1957.2483235400. The cubic root of 3830821 is about 156.4698332842.

The spelling of 3830821 in words is "three million, eight hundred thirty thousand, eight hundred twenty-one".