442423 has 4 divisors (see below), whose sum is σ = 444600. Its totient is φ = 440248.

The previous prime is 442399. The next prime is 442439. The reversal of 442423 is 324244.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442423 is a prime.

It is a super-2 number, since 2×442423² = 391476221858, which contains 22 as substring.

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 442423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (111150).

2⁴⁴²⁴²³ is an apocalyptic number.

442423 is a deficient number, since it is larger than the sum of its proper divisors (2177).

442423 is a wasteful number, since it uses less digits than its factorization.

442423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176.

The product of its digits is 768, while the sum is 19.

The square root of 442423 is about 665.1488555203. The cubic root of 442423 is about 76.1984081710.

Adding to 442423 its reverse (324244), we get a palindrome (766667).

It can be divided in two parts, 442 and 423, that multiplied together give a triangular number (186966 = T₆₁₁).

The spelling of 442423 in words is "four hundred forty-two thousand, four hundred twenty-three", and thus it is an iban number.