208986705 has 12 divisors (see below), whose sum is σ = 362243700. Its totient is φ = 111459552.

The previous prime is 208986667. The next prime is 208986707. The reversal of 208986705 is 507689802.

It can be written as a sum of positive squares in 2 ways, for example, as 39388176 + 169598529 = 6276^2 + 13023^2 .

It is not a de Polignac number, because 208986705 - 2⁶ = 208986641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4644149 = 208986705 / (2 + 0 + 8 + 9 + 8 + 6 + 7 + 0 + 5).

It is not an unprimeable number, because it can be changed into a prime (208986707) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2322030 + ... + 2322119.

It is an arithmetic number, because the mean of its divisors is an integer number (30186975).

Almost surely, 2^208986705 is an apocalyptic number.

It is an amenable number.

208986705 is a deficient number, since it is larger than the sum of its proper divisors (153256995).

208986705 is a wasteful number, since it uses less digits than its factorization.

208986705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4644160 (or 4644157 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 208986705 is about 14456.3724702983. The cubic root of 208986705 is about 593.4346302314.

The spelling of 208986705 in words is "two hundred eight million, nine hundred eighty-six thousand, seven hundred five".