3821689 has 2 divisors, whose sum is σ = 3821690. Its totient is φ = 3821688.

The previous prime is 3821687. The next prime is 3821723. The reversal of 3821689 is 9861283.

3821689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2805625 + 1016064 = 1675^2 + 1008^2 .

It is a cyclic number.

It is not a de Polignac number, because 3821689 - 2¹ = 3821687 is a prime.

Together with 3821687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3821681) 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 as a sum of consecutive naturals, namely, 1910844 + 1910845.

It is an arithmetic number, because the mean of its divisors is an integer number (1910845).

Almost surely, 2^3821689 is an apocalyptic number.

It is an amenable number.

3821689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3821689 is an equidigital number, since it uses as much as digits as its factorization.

3821689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 3821689 is about 1954.9140646074. The cubic root of 3821689 is about 156.3454022180.

The spelling of 3821689 in words is "three million, eight hundred twenty-one thousand, six hundred eighty-nine".