643346 has 8 divisors (see below), whose sum is σ = 1052784. Its totient is φ = 292420.

The previous prime is 643303. The next prime is 643369.

643346 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

643346 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14600 + ... + 14643.

It is an arithmetic number, because the mean of its divisors is an integer number (131598).

2⁶⁴³³⁴⁶ is an apocalyptic number.

643346 is a deficient number, since it is larger than the sum of its proper divisors (409438).

643346 is a wasteful number, since it uses less digits than its factorization.

643346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29256.

The product of its digits is 5184, while the sum is 26.

The square root of 643346 is about 802.0885237927. The cubic root of 643346 is about 86.3273086868.

It can be divided in two parts, 643 and 346, that added together give a palindrome (989).

The spelling of 643346 in words is "six hundred forty-three thousand, three hundred forty-six".