42823 has 8 divisors (see below), whose sum is σ = 49680. Its totient is φ = 36480.

The previous prime is 42821. The next prime is 42829. The reversal of 42823 is 32824.

It is a happy number.

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 42823 - 2¹ = 42821 is a prime.

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 42823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42821) 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, 73 + ... + 301.

It is an arithmetic number, because the mean of its divisors is an integer number (6210).

2⁴²⁸²³ is an apocalyptic number.

42823 is a deficient number, since it is larger than the sum of its proper divisors (6857).

42823 is a wasteful number, since it uses less digits than its factorization.

42823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257.

The product of its digits is 384, while the sum is 19.

The square root of 42823 is about 206.9371885380. The cubic root of 42823 is about 34.9858446159.

Subtracting from 42823 its reverse (32824), we obtain a palindrome (9999).

The spelling of 42823 in words is "forty-two thousand, eight hundred twenty-three".