1782223 has 4 divisors (see below), whose sum is σ = 1789920. Its totient is φ = 1774528.

The previous prime is 1782211. The next prime is 1782239. The reversal of 1782223 is 3222871.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1782223 - 2¹⁷ = 1651151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1782203) 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 in 3 ways as a sum of consecutive naturals, for example, 3490 + ... + 3967.

It is an arithmetic number, because the mean of its divisors is an integer number (447480).

2^1782223 is an apocalyptic number.

1782223 is a deficient number, since it is larger than the sum of its proper divisors (7697).

1782223 is an equidigital number, since it uses as much as digits as its factorization.

1782223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696.

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

The square root of 1782223 is about 1334.9992509361. Note that the first 3 decimals coincide. The cubic root of 1782223 is about 121.2422576273.

It can be divided in two parts, 1782 and 223, that multiplied together give a triangular number (397386 = T₈₉₁).

The spelling of 1782223 in words is "one million, seven hundred eighty-two thousand, two hundred twenty-three".