642335943 has 4 divisors (see below), whose sum is σ = 856447928. Its totient is φ = 428223960.

The previous prime is 642335851. The next prime is 642335959. The reversal of 642335943 is 349533246.

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

It is not a de Polignac number, because 642335943 - 2⁹ = 642335431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642315943) 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, 107055988 + ... + 107055993.

It is an arithmetic number, because the mean of its divisors is an integer number (214111982).

Almost surely, 2^642335943 is an apocalyptic number.

642335943 is a deficient number, since it is larger than the sum of its proper divisors (214111985).

642335943 is a wasteful number, since it uses less digits than its factorization.

642335943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214111984.

The product of its digits is 233280, while the sum is 39.

The square root of 642335943 is about 25344.3473579416. The cubic root of 642335943 is about 862.8210689558.

The spelling of 642335943 in words is "six hundred forty-two million, three hundred thirty-five thousand, nine hundred forty-three".