208987385 has 4 divisors (see below), whose sum is σ = 250784868. Its totient is φ = 167189904.

The previous prime is 208987379. The next prime is 208987391. The reversal of 208987385 is 583789802.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (208987379) and next prime (208987391).

It can be written as a sum of positive squares in 2 ways, for example, as 73753744 + 135233641 = 8588^2 + 11629^2 .

It is a cyclic number.

It is not a de Polignac number, because 208987385 - 2¹⁴ = 208971001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20898734 + ... + 20898743.

It is an arithmetic number, because the mean of its divisors is an integer number (62696217).

Almost surely, 2^208987385 is an apocalyptic number.

It is an amenable number.

208987385 is a deficient number, since it is larger than the sum of its proper divisors (41797483).

208987385 is an equidigital number, since it uses as much as digits as its factorization.

208987385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41797482.

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 208987385 is about 14456.3959893191. The cubic root of 208987385 is about 593.4352738690.

The spelling of 208987385 in words is "two hundred eight million, nine hundred eighty-seven thousand, three hundred eighty-five".