3831821 has 8 divisors (see below), whose sum is σ = 4392000. Its totient is φ = 3274848.

The previous prime is 3831811. The next prime is 3831827. The reversal of 3831821 is 1281383.

3831821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3831821 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 (3831827) 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, 2945 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (549000).

Almost surely, 2^3831821 is an apocalyptic number.

It is an amenable number.

3831821 is a deficient number, since it is larger than the sum of its proper divisors (560179).

3831821 is a wasteful number, since it uses less digits than its factorization.

3831821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603.

The product of its digits is 1152, while the sum is 26.

The square root of 3831821 is about 1957.5037675570. The cubic root of 3831821 is about 156.4834470953.

The spelling of 3831821 in words is "three million, eight hundred thirty-one thousand, eight hundred twenty-one".