340439839 has 2 divisors, whose sum is σ = 340439840. Its totient is φ = 340439838.

The previous prime is 340439783. The next prime is 340439893. The reversal of 340439839 is 938934043.

Together with next prime (340439893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 340439839 - 2¹¹ = 340437791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 340439795 and 340439804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340439339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170219919 + 170219920.

It is an arithmetic number, because the mean of its divisors is an integer number (170219920).

Almost surely, 2^340439839 is an apocalyptic number.

340439839 is a deficient number, since it is larger than the sum of its proper divisors (1).

340439839 is an equidigital number, since it uses as much as digits as its factorization.

340439839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 340439839 is about 18451.0118692716. The cubic root of 340439839 is about 698.2540426883.

The spelling of 340439839 in words is "three hundred forty million, four hundred thirty-nine thousand, eight hundred thirty-nine".