643846 has 8 divisors (see below), whose sum is σ = 1103760. Its totient is φ = 275928.

The previous prime is 643781. The next prime is 643847. The reversal of 643846 is 648346.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643847) 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, 22981 + ... + 23008.

It is an arithmetic number, because the mean of its divisors is an integer number (137970).

2⁶⁴³⁸⁴⁶ is an apocalyptic number.

643846 is a deficient number, since it is larger than the sum of its proper divisors (459914).

643846 is a wasteful number, since it uses less digits than its factorization.

643846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45998.

The product of its digits is 13824, while the sum is 31.

The square root of 643846 is about 802.4001495513. The cubic root of 643846 is about 86.3496670430.

The spelling of 643846 in words is "six hundred forty-three thousand, eight hundred forty-six".