208671985 has 12 divisors (see below), whose sum is σ = 261770292. Its totient is φ = 159677408.

The previous prime is 208671977. The next prime is 208671989. The reversal of 208671985 is 589176802.

It can be written as a sum of positive squares in 2 ways, for example, as 78004224 + 130667761 = 8832^2 + 11431^2 .

It is not a de Polignac number, because 208671985 - 2³ = 208671977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208671989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36802 + ... + 42091.

It is an arithmetic number, because the mean of its divisors is an integer number (21814191).

Almost surely, 2^208671985 is an apocalyptic number.

It is an amenable number.

208671985 is a deficient number, since it is larger than the sum of its proper divisors (53098307).

208671985 is an equidigital number, since it uses as much as digits as its factorization.

208671985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78944 (or 78921 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 208671985 is about 14445.4832041022. The cubic root of 208671985 is about 593.1365896174.

The spelling of 208671985 in words is "two hundred eight million, six hundred seventy-one thousand, nine hundred eighty-five".