208888889 has 4 divisors (see below), whose sum is σ = 227878800. Its totient is φ = 189898980.

The previous prime is 208888873. The next prime is 208888909. The reversal of 208888889 is 988888802.

It is a happy number.

208888889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208888889 - 2⁴ = 208888873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208888859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9494939 + ... + 9494960.

It is an arithmetic number, because the mean of its divisors is an integer number (56969700).

Almost surely, 2^208888889 is an apocalyptic number.

It is an amenable number.

208888889 is a deficient number, since it is larger than the sum of its proper divisors (18989911).

208888889 is a wasteful number, since it uses less digits than its factorization.

208888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18989910.

The product of its (nonzero) digits is 4718592, while the sum is 59.

The square root of 208888889 is about 14452.9889296297. The cubic root of 208888889 is about 593.3420303050.

The spelling of 208888889 in words is "two hundred eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".