208347989 has 2 divisors, whose sum is σ = 208347990. Its totient is φ = 208347988.

The previous prime is 208347983. The next prime is 208347991. The reversal of 208347989 is 989743802.

It is a happy number.

208347989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170093764 + 38254225 = 13042^2 + 6185^2 .

It is a cyclic number.

It is not a de Polignac number, because 208347989 - 2⁴ = 208347973 is a prime.

Together with 208347991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208347983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104173994 + 104173995.

It is an arithmetic number, because the mean of its divisors is an integer number (104173995).

Almost surely, 2^208347989 is an apocalyptic number.

It is an amenable number.

208347989 is a deficient number, since it is larger than the sum of its proper divisors (1).

208347989 is an equidigital number, since it uses as much as digits as its factorization.

208347989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 208347989 is about 14434.2644079981. The cubic root of 208347989 is about 592.8294513938.

The spelling of 208347989 in words is "two hundred eight million, three hundred forty-seven thousand, nine hundred eighty-nine".