208870389 has 36 divisors (see below), whose sum is σ = 377966316. Its totient is φ = 110170368.

The previous prime is 208870379. The next prime is 208870411. The reversal of 208870389 is 983078802.

It can be written as a sum of positive squares in 2 ways, for example, as 109369764 + 99500625 = 10458^2 + 9975^2 .

It is not a de Polignac number, because 208870389 - 2⁸ = 208870133 is a prime.

It is a super-2 number, since 2×208870389² = 87253678802022642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208870369) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 12484 + ... + 23949.

Almost surely, 2^208870389 is an apocalyptic number.

It is an amenable number.

208870389 is a deficient number, since it is larger than the sum of its proper divisors (169095927).

208870389 is a wasteful number, since it uses less digits than its factorization.

208870389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36466 (or 36456 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 208870389 is about 14452.3489094334. The cubic root of 208870389 is about 593.3245135737.

The spelling of 208870389 in words is "two hundred eight million, eight hundred seventy thousand, three hundred eighty-nine".