208684939 has 2 divisors, whose sum is σ = 208684940. Its totient is φ = 208684938.

The previous prime is 208684919. The next prime is 208684981. The reversal of 208684939 is 939486802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208684939 - 2¹³ = 208676747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 208684892 and 208684901.

It is not a weakly prime, because it can be changed into another prime (208684919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104342469 + 104342470.

It is an arithmetic number, because the mean of its divisors is an integer number (104342470).

Almost surely, 2^208684939 is an apocalyptic number.

208684939 is a deficient number, since it is larger than the sum of its proper divisors (1).

208684939 is an equidigital number, since it uses as much as digits as its factorization.

208684939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 208684939 is about 14445.9315725916. The cubic root of 208684939 is about 593.1488629985.

It can be divided in two parts, 2086 and 84939, that added together give a square (87025 = 295²).

The spelling of 208684939 in words is "two hundred eight million, six hundred eighty-four thousand, nine hundred thirty-nine".