239989791905 has 4 divisors (see below), whose sum is σ = 287987750292. Its totient is φ = 191991833520.

The previous prime is 239989791883. The next prime is 239989791907. The reversal of 239989791905 is 509197989932.

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

It can be written as a sum of positive squares in 2 ways, for example, as 172696762624 + 67293029281 = 415568^2 + 259409^2 .

It is not a de Polignac number, because 239989791905 - 2⁶ = 239989791841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239989791907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23998979186 + ... + 23998979195.

It is an arithmetic number, because the mean of its divisors is an integer number (71996937573).

Almost surely, 2^239989791905 is an apocalyptic number.

It is an amenable number.

239989791905 is a deficient number, since it is larger than the sum of its proper divisors (47997958387).

239989791905 is an equidigital number, since it uses as much as digits as its factorization.

239989791905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47997958386.

The product of its (nonzero) digits is 99202320, while the sum is 71.

The spelling of 239989791905 in words is "two hundred thirty-nine billion, nine hundred eighty-nine million, seven hundred ninety-one thousand, nine hundred five".