423642839 has 4 divisors (see below), whose sum is σ = 448563024. Its totient is φ = 398722656.

The previous prime is 423642827. The next prime is 423642841. The reversal of 423642839 is 938246324.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 423642839 - 2⁴ = 423642823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423642796 and 423642805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423642889) 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 3 ways as a sum of consecutive naturals, for example, 12460067 + ... + 12460100.

It is an arithmetic number, because the mean of its divisors is an integer number (112140756).

Almost surely, 2^423642839 is an apocalyptic number.

423642839 is a deficient number, since it is larger than the sum of its proper divisors (24920185).

423642839 is a wasteful number, since it uses less digits than its factorization.

423642839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24920184.

The product of its digits is 248832, while the sum is 41.

The square root of 423642839 is about 20582.5858190850. The cubic root of 423642839 is about 751.0461483826.

The spelling of 423642839 in words is "four hundred twenty-three million, six hundred forty-two thousand, eight hundred thirty-nine".