643347 has 6 divisors (see below), whose sum is σ = 929292. Its totient is φ = 428892.

The previous prime is 643303. The next prime is 643369. The reversal of 643347 is 743346.

It is not a de Polignac number, because 643347 - 2¹¹ = 641299 is a prime.

643347 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 643347.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643347.

It is not an unprimeable number, because it can be changed into a prime (643547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35733 + ... + 35750.

It is an arithmetic number, because the mean of its divisors is an integer number (154882).

2⁶⁴³³⁴⁷ is an apocalyptic number.

643347 is a deficient number, since it is larger than the sum of its proper divisors (285945).

643347 is a wasteful number, since it uses less digits than its factorization.

643347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71489 (or 71486 counting only the distinct ones).

The product of its digits is 6048, while the sum is 27.

The square root of 643347 is about 802.0891471651. The cubic root of 643347 is about 86.3273534151.

Subtracting 643347 from its reverse (743346), we obtain a palindrome (99999).

It can be divided in two parts, 643 and 347, that added together give a triangular number (990 = T₄₄).

The spelling of 643347 in words is "six hundred forty-three thousand, three hundred forty-seven".