239980809 has 4 divisors (see below), whose sum is σ = 319974416. Its totient is φ = 159987204.

The previous prime is 239980799. The next prime is 239980843. The reversal of 239980809 is 908089932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 239980809 - 2⁷ = 239980681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (239900809) 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, 39996799 + ... + 39996804.

It is an arithmetic number, because the mean of its divisors is an integer number (79993604).

Almost surely, 2^239980809 is an apocalyptic number.

It is an amenable number.

239980809 is a deficient number, since it is larger than the sum of its proper divisors (79993607).

239980809 is an equidigital number, since it uses as much as digits as its factorization.

239980809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79993606.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 239980809 is about 15491.3139855856. The cubic root of 239980809 is about 621.4299366106.

The spelling of 239980809 in words is "two hundred thirty-nine million, nine hundred eighty thousand, eight hundred nine".