1820743 has 2 divisors, whose sum is σ = 1820744. Its totient is φ = 1820742.

The previous prime is 1820737. The next prime is 1820747. The reversal of 1820743 is 3470281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1820743 - 2⁵ = 1820711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910371 + 910372.

It is an arithmetic number, because the mean of its divisors is an integer number (910372).

2^1820743 is an apocalyptic number.

1820743 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820743 is an equidigital number, since it uses as much as digits as its factorization.

1820743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1820743 is about 1349.3491023453. The cubic root of 1820743 is about 122.1095271897.

The spelling of 1820743 in words is "one million, eight hundred twenty thousand, seven hundred forty-three".