208912987 has 6 divisors (see below), whose sum is σ = 209795348. Its totient is φ = 208034304.

The previous prime is 208912927. The next prime is 208913021. The reversal of 208912987 is 789219802.

It is not a de Polignac number, because 208912987 - 2¹⁵ = 208880219 is a prime.

It is a super-2 number, since 2×208912987² = 87289272274524338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208912927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64468 + ... + 67630.

Almost surely, 2^208912987 is an apocalyptic number.

208912987 is a deficient number, since it is larger than the sum of its proper divisors (882361).

208912987 is an frugal number, since it uses more digits than its factorization.

208912987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677 (or 3420 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 208912987 is about 14453.8225739768. The cubic root of 208912987 is about 593.3648459536.

The spelling of 208912987 in words is "two hundred eight million, nine hundred twelve thousand, nine hundred eighty-seven".