208880989 has 4 divisors (see below), whose sum is σ = 221168124. Its totient is φ = 196593856.

The previous prime is 208880983. The next prime is 208880993. The reversal of 208880989 is 989088802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63075364 + 145805625 = 7942^2 + 12075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208880989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208880983) 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, 6143542 + ... + 6143575.

It is an arithmetic number, because the mean of its divisors is an integer number (55292031).

Almost surely, 2^208880989 is an apocalyptic number.

It is an amenable number.

208880989 is a deficient number, since it is larger than the sum of its proper divisors (12287135).

208880989 is a wasteful number, since it uses less digits than its factorization.

208880989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12287134.

The product of its (nonzero) digits is 663552, while the sum is 52.

The square root of 208880989 is about 14452.7156271754. The cubic root of 208880989 is about 593.3345503138.

The spelling of 208880989 in words is "two hundred eight million, eight hundred eighty thousand, nine hundred eighty-nine".