205871538 has 8 divisors (see below), whose sum is σ = 411743088. Its totient is φ = 68623844.

The previous prime is 205871489. The next prime is 205871563. The reversal of 205871538 is 835178502.

It is a sphenic number, since it is the product of 3 distinct primes.

205871538 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 205871496 and 205871505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17155956 + ... + 17155967.

It is an arithmetic number, because the mean of its divisors is an integer number (51467886).

Almost surely, 2^205871538 is an apocalyptic number.

205871538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

205871538 is a wasteful number, since it uses less digits than its factorization.

205871538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34311928.

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 205871538 is about 14348.2242106820. The cubic root of 205871538 is about 590.4712676342.

The spelling of 205871538 in words is "two hundred five million, eight hundred seventy-one thousand, five hundred thirty-eight".