3820391 has 2 divisors, whose sum is σ = 3820392. Its totient is φ = 3820390.

The previous prime is 3820379. The next prime is 3820423. The reversal of 3820391 is 1930283.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3820391 - 2¹⁰ = 3819367 is a prime.

It is a Chen prime.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 3820391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3820321) 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, 1910195 + 1910196.

It is an arithmetic number, because the mean of its divisors is an integer number (1910196).

Almost surely, 2^3820391 is an apocalyptic number.

3820391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3820391 is an equidigital number, since it uses as much as digits as its factorization.

3820391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 3820391 is about 1954.5820525115. The cubic root of 3820391 is about 156.3276998085.

The spelling of 3820391 in words is "three million, eight hundred twenty thousand, three hundred ninety-one".