208908649 has 4 divisors (see below), whose sum is σ = 209192080. Its totient is φ = 208625220.

The previous prime is 208908647. The next prime is 208908671. The reversal of 208908649 is 946809802.

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 208908649 - 2¹ = 208908647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208908599 and 208908608.

It is not an unprimeable number, because it can be changed into a prime (208908643) 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, 140607 + ... + 142084.

It is an arithmetic number, because the mean of its divisors is an integer number (52298020).

Almost surely, 2^208908649 is an apocalyptic number.

It is an amenable number.

208908649 is a deficient number, since it is larger than the sum of its proper divisors (283431).

208908649 is an equidigital number, since it uses as much as digits as its factorization.

208908649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283430.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 208908649 is about 14453.6725090892. The cubic root of 208908649 is about 593.3607389255.

The spelling of 208908649 in words is "two hundred eight million, nine hundred eight thousand, six hundred forty-nine".