3820321 has 2 divisors, whose sum is σ = 3820322. Its totient is φ = 3820320.

The previous prime is 3820319. The next prime is 3820343. The reversal of 3820321 is 1230283.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143296 + 1677025 = 1464^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 3820321 - 2¹ = 3820319 is a prime.

Together with 3820319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3820351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910160 + 1910161.

It is an arithmetic number, because the mean of its divisors is an integer number (1910161).

Almost surely, 2^3820321 is an apocalyptic number.

It is an amenable number.

3820321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3820321 is an equidigital number, since it uses as much as digits as its factorization.

3820321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 3820321 is about 1954.5641457880. The cubic root of 3820321 is about 156.3267450191.

The spelling of 3820321 in words is "three million, eight hundred twenty thousand, three hundred twenty-one".