643123 has 8 divisors (see below), whose sum is σ = 704816. Its totient is φ = 583200.

The previous prime is 643121. The next prime is 643129. The reversal of 643123 is 321346.

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

It is a cyclic number.

It is not a de Polignac number, because 643123 - 2¹ = 643121 is a prime.

It is a d-powerful number, because it can be written as 6⁶ + 4⁸ + 1 + 3⁴ + 2¹⁹ + 3⁸ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643123.

It is not an unprimeable number, because it can be changed into a prime (643121) 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, 388 + ... + 1198.

It is an arithmetic number, because the mean of its divisors is an integer number (88102).

2⁶⁴³¹²³ is an apocalyptic number.

643123 is a deficient number, since it is larger than the sum of its proper divisors (61693).

643123 is a wasteful number, since it uses less digits than its factorization.

643123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885.

The product of its digits is 432, while the sum is 19.

The square root of 643123 is about 801.9494996569. The cubic root of 643123 is about 86.3173331244.

Adding to 643123 its reverse (321346), we get a palindrome (964469).

The spelling of 643123 in words is "six hundred forty-three thousand, one hundred twenty-three".