642232423 has 4 divisors (see below), whose sum is σ = 733979920. Its totient is φ = 550484928.

The previous prime is 642232399. The next prime is 642232447. The reversal of 642232423 is 324232246.

642232423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (642232399) and next prime (642232447).

It is not a de Polignac number, because 642232423 - 2²¹ = 640135271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642232391 and 642232400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642232823) 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, 45873738 + ... + 45873751.

It is an arithmetic number, because the mean of its divisors is an integer number (183494980).

Almost surely, 2^642232423 is an apocalyptic number.

642232423 is a deficient number, since it is larger than the sum of its proper divisors (91747497).

642232423 is an equidigital number, since it uses as much as digits as its factorization.

642232423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91747496.

The product of its digits is 13824, while the sum is 28.

The square root of 642232423 is about 25342.3050056620. The cubic root of 642232423 is about 862.7747152076.

Adding to 642232423 its reverse (324232246), we get a palindrome (966464669).

The spelling of 642232423 in words is "six hundred forty-two million, two hundred thirty-two thousand, four hundred twenty-three".