205839870 has 16 divisors (see below), whose sum is σ = 494015760. Its totient is φ = 54890624.

The previous prime is 205839847. The next prime is 205839877. The reversal of 205839870 is 78938502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205839877) 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 7 ways as a sum of consecutive naturals, for example, 3430635 + ... + 3430694.

It is an arithmetic number, because the mean of its divisors is an integer number (30875985).

Almost surely, 2^205839870 is an apocalyptic number.

205839870 is an abundant number, since it is smaller than the sum of its proper divisors (288175890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205839870 is a wasteful number, since it uses less digits than its factorization.

205839870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6861339.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 205839870 is about 14347.1206170437. The cubic root of 205839870 is about 590.4409898484.

The spelling of 205839870 in words is "two hundred five million, eight hundred thirty-nine thousand, eight hundred seventy".