340242839 has 2 divisors, whose sum is σ = 340242840. Its totient is φ = 340242838.

The previous prime is 340242827. The next prime is 340242883. The reversal of 340242839 is 938242043.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340242839 - 2⁸ = 340242583 is a prime.

It is equal to p_18307079 and since 340242839 and 18307079 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 340242799 and 340242808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340242739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170121419 + 170121420.

It is an arithmetic number, because the mean of its divisors is an integer number (170121420).

Almost surely, 2^340242839 is an apocalyptic number.

340242839 is a deficient number, since it is larger than the sum of its proper divisors (1).

340242839 is an equidigital number, since it uses as much as digits as its factorization.

340242839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 340242839 is about 18445.6726361497. The cubic root of 340242839 is about 698.1193320659.

It can be divided in two parts, 34024 and 2839, that added together give a palindrome (36863).

The spelling of 340242839 in words is "three hundred forty million, two hundred forty-two thousand, eight hundred thirty-nine".