239309139 has 4 divisors (see below), whose sum is σ = 319078856. Its totient is φ = 159539424.

The previous prime is 239309137. The next prime is 239309149. The reversal of 239309139 is 931903932.

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

It is not a de Polignac number, because 239309139 - 2¹ = 239309137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 239309097 and 239309106.

It is not an unprimeable number, because it can be changed into a prime (239309137) 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, 39884854 + ... + 39884859.

It is an arithmetic number, because the mean of its divisors is an integer number (79769714).

Almost surely, 2^239309139 is an apocalyptic number.

239309139 is a deficient number, since it is larger than the sum of its proper divisors (79769717).

239309139 is an equidigital number, since it uses as much as digits as its factorization.

239309139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79769716.

The product of its (nonzero) digits is 39366, while the sum is 39.

The square root of 239309139 is about 15469.6198725114. The cubic root of 239309139 is about 620.8496320671.

The spelling of 239309139 in words is "two hundred thirty-nine million, three hundred nine thousand, one hundred thirty-nine".