208649239 has 2 divisors, whose sum is σ = 208649240. Its totient is φ = 208649238.

The previous prime is 208649227. The next prime is 208649267. The reversal of 208649239 is 932946802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208649239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 208649195 and 208649204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208649269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104324619 + 104324620.

It is an arithmetic number, because the mean of its divisors is an integer number (104324620).

Almost surely, 2^208649239 is an apocalyptic number.

208649239 is a deficient number, since it is larger than the sum of its proper divisors (1).

208649239 is an equidigital number, since it uses as much as digits as its factorization.

208649239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 208649239 is about 14444.6958777262. The cubic root of 208649239 is about 593.1150374909.

It can be divided in two parts, 20864 and 9239, that added together give a palindrome (30103).

The spelling of 208649239 in words is "two hundred eight million, six hundred forty-nine thousand, two hundred thirty-nine".