646943 has 8 divisors (see below), whose sum is σ = 713856. Its totient is φ = 581400.

The previous prime is 646937. The next prime is 646957. The reversal of 646943 is 349646.

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

It is a cyclic number.

It is not a de Polignac number, because 646943 - 2⁴ = 646927 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646943.

It is not an unprimeable number, because it can be changed into a prime (646913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (89232).

2⁶⁴⁶⁹⁴³ is an apocalyptic number.

646943 is a deficient number, since it is larger than the sum of its proper divisors (66913).

646943 is a wasteful number, since it uses less digits than its factorization.

646943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685.

The product of its digits is 15552, while the sum is 32.

The square root of 646943 is about 804.3276695477. The cubic root of 646943 is about 86.4878974458.

It can be divided in two parts, 64 and 6943, that added together give a palindrome (7007).

The spelling of 646943 in words is "six hundred forty-six thousand, nine hundred forty-three".