1643223 has 4 divisors (see below), whose sum is σ = 2190968. Its totient is φ = 1095480.

The previous prime is 1643221. The next prime is 1643231. The reversal of 1643223 is 3223461.

It is a happy number.

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

It is not a de Polignac number, because 1643223 - 2¹ = 1643221 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁶ + 4² + 3⁷ + 2³ + 2⁵ + 3¹³ .

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1643223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643221) 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 in 3 ways as a sum of consecutive naturals, for example, 273868 + ... + 273873.

It is an arithmetic number, because the mean of its divisors is an integer number (547742).

2^1643223 is an apocalyptic number.

1643223 is a deficient number, since it is larger than the sum of its proper divisors (547745).

1643223 is an equidigital number, since it uses as much as digits as its factorization.

1643223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547744.

The product of its digits is 864, while the sum is 21.

The square root of 1643223 is about 1281.8825999287. The cubic root of 1643223 is about 118.0045722637.

Adding to 1643223 its reverse (3223461), we get a palindrome (4866684).

The spelling of 1643223 in words is "one million, six hundred forty-three thousand, two hundred twenty-three".