3503821 has 2 divisors, whose sum is σ = 3503822. Its totient is φ = 3503820.

The previous prime is 3503813. The next prime is 3503831. The reversal of 3503821 is 1283053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 1512900 = 1411^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 3503821 - 2³ = 3503813 is a prime.

It is equal to p₂₅₀₃₉₃ and since 3503821 and 250393 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 3503792 and 3503801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3503831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1751910 + 1751911.

It is an arithmetic number, because the mean of its divisors is an integer number (1751911).

Almost surely, 2^3503821 is an apocalyptic number.

It is an amenable number.

3503821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3503821 is an equidigital number, since it uses as much as digits as its factorization.

3503821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 3503821 is about 1871.8496200283. The cubic root of 3503821 is about 151.8846799590.

Adding to 3503821 its reverse (1283053), we get a palindrome (4786874).

The spelling of 3503821 in words is "three million, five hundred three thousand, eight hundred twenty-one".