643023 has 12 divisors (see below), whose sum is σ = 954408. Its totient is φ = 416880.

The previous prime is 643021. The next prime is 643031. The reversal of 643023 is 320346.

643023 is a `hidden beast` number, since 643 + 0 + 23 = 666.

It is not a de Polignac number, because 643023 - 2¹ = 643021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642987 and 643005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 633 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (79534).

2⁶⁴³⁰²³ is an apocalyptic number.

643023 is a deficient number, since it is larger than the sum of its proper divisors (311385).

643023 is a wasteful number, since it uses less digits than its factorization.

643023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974 (or 1971 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 643023 is about 801.8871491675. The cubic root of 643023 is about 86.3128590291.

Adding to 643023 its reverse (320346), we get a palindrome (963369).

The spelling of 643023 in words is "six hundred forty-three thousand, twenty-three".