643434 has 16 divisors (see below), whose sum is σ = 1404000. Its totient is φ = 194960.

The previous prime is 643429. The next prime is 643439. The reversal of 643434 is 434346.

643434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643429) and next prime (643439).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643434.

It is not an unprimeable number, because it can be changed into a prime (643439) by changing a digit.

643434 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, 4809 + ... + 4940.

It is an arithmetic number, because the mean of its divisors is an integer number (87750).

2⁶⁴³⁴³⁴ is an apocalyptic number.

643434 is an abundant number, since it is smaller than the sum of its proper divisors (760566).

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

643434 is a wasteful number, since it uses less digits than its factorization.

643434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765.

The product of its digits is 3456, while the sum is 24.

The square root of 643434 is about 802.1433787048. The cubic root of 643434 is about 86.3312445973.

The spelling of 643434 in words is "six hundred forty-three thousand, four hundred thirty-four".