206886905 has 16 divisors (see below), whose sum is σ = 252436800. Its totient is φ = 162751680.

The previous prime is 206886893. The next prime is 206886913. The reversal of 206886905 is 509688602.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-206886905 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 74390 + ... + 77120.

It is an arithmetic number, because the mean of its divisors is an integer number (15777300).

Almost surely, 2^206886905 is an apocalyptic number.

It is an amenable number.

206886905 is a deficient number, since it is larger than the sum of its proper divisors (45549895).

206886905 is a wasteful number, since it uses less digits than its factorization.

206886905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 206886905 is about 14383.5637100129. The cubic root of 206886905 is about 591.4404190395.

The spelling of 206886905 in words is "two hundred six million, eight hundred eighty-six thousand, nine hundred five".