3704821 has 2 divisors, whose sum is σ = 3704822. Its totient is φ = 3704820.

The previous prime is 3704819. The next prime is 3704843. The reversal of 3704821 is 1284073.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 52900 = 1911^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 3704821 - 2¹ = 3704819 is a prime.

Together with 3704819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3704621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1852410 + 1852411.

It is an arithmetic number, because the mean of its divisors is an integer number (1852411).

Almost surely, 2^3704821 is an apocalyptic number.

It is an amenable number.

3704821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3704821 is an equidigital number, since it uses as much as digits as its factorization.

3704821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 3704821 is about 1924.7911575025. The cubic root of 3704821 is about 154.7351843129.

Adding to 3704821 its reverse (1284073), we get a palindrome (4988894).

The spelling of 3704821 in words is "three million, seven hundred four thousand, eight hundred twenty-one".