643343 has 4 divisors (see below), whose sum is σ = 664128. Its totient is φ = 622560.

The previous prime is 643303. The next prime is 643369. The reversal of 643343 is 343346.

643343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 343346 = 2 ⋅171673.

It is a cyclic number.

It is not a de Polignac number, because 643343 - 2⁸ = 643087 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 (643303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10346 + ... + 10407.

It is an arithmetic number, because the mean of its divisors is an integer number (166032).

2⁶⁴³³⁴³ is an apocalyptic number.

643343 is a deficient number, since it is larger than the sum of its proper divisors (20785).

643343 is a wasteful number, since it uses less digits than its factorization.

643343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20784.

The product of its digits is 2592, while the sum is 23.

The square root of 643343 is about 802.0866536728. The cubic root of 643343 is about 86.3271745017.

Adding to 643343 its reverse (343346), we get a palindrome (986689).

The spelling of 643343 in words is "six hundred forty-three thousand, three hundred forty-three".