3504821 has 2 divisors, whose sum is σ = 3504822. Its totient is φ = 3504820.

The previous prime is 3504811. The next prime is 3504857. The reversal of 3504821 is 1284053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3496900 + 7921 = 1870^2 + 89^2 .

It is an emirp because it is prime and its reverse (1284053) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3504821 - 2⁶ = 3504757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3504811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1752410 + 1752411.

It is an arithmetic number, because the mean of its divisors is an integer number (1752411).

Almost surely, 2^3504821 is an apocalyptic number.

It is an amenable number.

3504821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3504821 is an equidigital number, since it uses as much as digits as its factorization.

3504821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 3504821 is about 1872.1167164469. The cubic root of 3504821 is about 151.8991280176.

Adding to 3504821 its reverse (1284053), we get a palindrome (4788874).

The spelling of 3504821 in words is "three million, five hundred four thousand, eight hundred twenty-one".