205342839 has 24 divisors (see below), whose sum is σ = 319919600. Its totient is φ = 126168192.

The previous prime is 205342817. The next prime is 205342843. The reversal of 205342839 is 938243502.

It is not a de Polignac number, because 205342839 - 2¹⁷ = 205211767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205342639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120012 + ... + 121710.

Almost surely, 2^205342839 is an apocalyptic number.

205342839 is a deficient number, since it is larger than the sum of its proper divisors (114576761).

205342839 is a wasteful number, since it uses less digits than its factorization.

205342839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751 (or 2748 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 205342839 is about 14329.7885190257. The cubic root of 205342839 is about 589.9653709447.

The spelling of 205342839 in words is "two hundred five million, three hundred forty-two thousand, eight hundred thirty-nine".