1806841 has 2 divisors, whose sum is σ = 1806842. Its totient is φ = 1806840.

The previous prime is 1806839. The next prime is 1806859. The reversal of 1806841 is 1486081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1371241 + 435600 = 1171^2 + 660^2 .

It is an emirp because it is prime and its reverse (1486081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1806841 - 2¹ = 1806839 is a prime.

Together with 1806839, 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 (1806041) 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, 903420 + 903421.

It is an arithmetic number, because the mean of its divisors is an integer number (903421).

2^1806841 is an apocalyptic number.

It is an amenable number.

1806841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806841 is an equidigital number, since it uses as much as digits as its factorization.

1806841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1806841 is about 1344.1878588947. The cubic root of 1806841 is about 121.7979500717.

It can be divided in two parts, 180 and 6841, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 1806841 in words is "one million, eight hundred six thousand, eight hundred forty-one".