643794 has 16 divisors (see below), whose sum is σ = 1309440. Its totient is φ = 210960.

The previous prime is 643781. The next prime is 643847. The reversal of 643794 is 497346.

643794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

643794 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 7 ways as a sum of consecutive naturals, for example, 514 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (81840).

2⁶⁴³⁷⁹⁴ is an apocalyptic number.

643794 is an abundant number, since it is smaller than the sum of its proper divisors (665646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643794 is a wasteful number, since it uses less digits than its factorization.

643794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825.

The product of its digits is 18144, while the sum is 33.

The square root of 643794 is about 802.3677461115. The cubic root of 643794 is about 86.3473423134.

The spelling of 643794 in words is "six hundred forty-three thousand, seven hundred ninety-four".