1643323 has 4 divisors (see below), whose sum is σ = 1792728. Its totient is φ = 1493920.

The previous prime is 1643311. The next prime is 1643347. The reversal of 1643323 is 3233461.

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 1643323 - 2⁹ = 1642811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1643294 and 1643303.

It is not an unprimeable number, because it can be changed into a prime (1643363) 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, 74686 + ... + 74707.

It is an arithmetic number, because the mean of its divisors is an integer number (448182).

2^1643323 is an apocalyptic number.

1643323 is a deficient number, since it is larger than the sum of its proper divisors (149405).

1643323 is a wasteful number, since it uses less digits than its factorization.

1643323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149404.

The product of its digits is 1296, while the sum is 22.

The square root of 1643323 is about 1281.9216044673. The cubic root of 1643323 is about 118.0069659777.

Adding to 1643323 its reverse (3233461), we get a palindrome (4876784).

The spelling of 1643323 in words is "one million, six hundred forty-three thousand, three hundred twenty-three".