1806943 has 2 divisors, whose sum is σ = 1806944. Its totient is φ = 1806942.

The previous prime is 1806941. The next prime is 1806953. The reversal of 1806943 is 3496081.

It is a weak prime.

It is an emirp because it is prime and its reverse (3496081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1806943 - 2¹ = 1806941 is a prime.

Together with 1806941, 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 (1806941) 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, 903471 + 903472.

It is an arithmetic number, because the mean of its divisors is an integer number (903472).

2^1806943 is an apocalyptic number.

1806943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806943 is an equidigital number, since it uses as much as digits as its factorization.

1806943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1806943 is about 1344.2257994846. The cubic root of 1806943 is about 121.8002419459.

The spelling of 1806943 in words is "one million, eight hundred six thousand, nine hundred forty-three".