1820341 has 2 divisors, whose sum is σ = 1820342. Its totient is φ = 1820340.

The previous prime is 1820339. The next prime is 1820347. The reversal of 1820341 is 1430281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1164241 + 656100 = 1079^2 + 810^2 .

It is an emirp because it is prime and its reverse (1430281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820341 - 2¹ = 1820339 is a prime.

Together with 1820339, 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 (1820347) 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, 910170 + 910171.

It is an arithmetic number, because the mean of its divisors is an integer number (910171).

2^1820341 is an apocalyptic number.

It is an amenable number.

1820341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820341 is an equidigital number, since it uses as much as digits as its factorization.

1820341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1820341 is about 1349.2001334124. The cubic root of 1820341 is about 122.1005397154.

The spelling of 1820341 in words is "one million, eight hundred twenty thousand, three hundred forty-one".