423643 has 8 divisors (see below), whose sum is σ = 486720. Its totient is φ = 364680.

The previous prime is 423617. The next prime is 423649. The reversal of 423643 is 346324.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423643 is a prime.

It is a Duffinian number.

423643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (423649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (60840).

2⁴²³⁶⁴³ is an apocalyptic number.

423643 is a deficient number, since it is larger than the sum of its proper divisors (63077).

423643 is a wasteful number, since it uses less digits than its factorization.

423643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057.

The product of its digits is 1728, while the sum is 22.

The square root of 423643 is about 650.8786369209. The cubic root of 423643 is about 75.1046243524.

Adding to 423643 its reverse (346324), we get a palindrome (769967).

The spelling of 423643 in words is "four hundred twenty-three thousand, six hundred forty-three".