239840109 has 10 divisors (see below), whose sum is σ = 358279790. Its totient is φ = 159893352.

The previous prime is 239840099. The next prime is 239840147. The reversal of 239840109 is 901048932.

It can be written as a sum of positive squares in only one way, i.e., 147622500 + 92217609 = 12150^2 + 9603^2 .

It is not a de Polignac number, because 239840109 - 2⁴ = 239840093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239840189) 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 9 ways as a sum of consecutive naturals, for example, 1480414 + ... + 1480575.

It is an arithmetic number, because the mean of its divisors is an integer number (35827979).

Almost surely, 2^239840109 is an apocalyptic number.

It is an amenable number.

239840109 is a deficient number, since it is larger than the sum of its proper divisors (118439681).

239840109 is an equidigital number, since it uses as much as digits as its factorization.

239840109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961001 (or 2960992 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 239840109 is about 15486.7720652175. The cubic root of 239840109 is about 621.3084653901.

The spelling of 239840109 in words is "two hundred thirty-nine million, eight hundred forty thousand, one hundred nine".