643046 has 8 divisors (see below), whose sum is σ = 997920. Its totient is φ = 310408.

The previous prime is 643043. The next prime is 643051. The reversal of 643046 is 640346.

643046 = 9² + 10² + ... + 124².

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5486 + ... + 5601.

It is an arithmetic number, because the mean of its divisors is an integer number (124740).

2⁶⁴³⁰⁴⁶ is an apocalyptic number.

643046 is a deficient number, since it is larger than the sum of its proper divisors (354874).

643046 is a wasteful number, since it uses less digits than its factorization.

643046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11118.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 643046 is about 801.9014902094. The cubic root of 643046 is about 86.3138881121.

The spelling of 643046 in words is "six hundred forty-three thousand, forty-six".