643433 has 8 divisors (see below), whose sum is σ = 778752. Its totient is φ = 518976.

The previous prime is 643429. The next prime is 643439. The reversal of 643433 is 334346.

643433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 643433 - 2² = 643429 is a prime.

It is a d-powerful number, because it can be written as 6⁶ + 4 + 4⁶ + 3⁷ + 3¹⁰ + 3¹² .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643399 and 643408.

It is not an unprimeable number, because it can be changed into a prime (643439) 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, 2585 + ... + 2822.

It is an arithmetic number, because the mean of its divisors is an integer number (97344).

2⁶⁴³⁴³³ is an apocalyptic number.

It is an amenable number.

643433 is a deficient number, since it is larger than the sum of its proper divisors (135319).

643433 is a wasteful number, since it uses less digits than its factorization.

643433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5431.

The product of its digits is 2592, while the sum is 23.

The square root of 643433 is about 802.1427553746. The cubic root of 643433 is about 86.3311998731.

Adding to 643433 its reverse (334346), we get a palindrome (977779).

It can be divided in two parts, 64343 and 3, that added together give a palindrome (64346).

The spelling of 643433 in words is "six hundred forty-three thousand, four hundred thirty-three".