208395009 has 12 divisors (see below), whose sum is σ = 302217552. Its totient is φ = 138375000.

The previous prime is 208395007. The next prime is 208395037. The reversal of 208395009 is 900593802.

208395009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 208395009 - 2¹ = 208395007 is a prime.

It is a super-2 number, since 2×208395009² = 86856959552220162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208395007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43867 + ... + 48384.

It is an arithmetic number, because the mean of its divisors is an integer number (25184796).

Almost surely, 2^208395009 is an apocalyptic number.

It is an amenable number.

208395009 is a deficient number, since it is larger than the sum of its proper divisors (93822543).

208395009 is a wasteful number, since it uses less digits than its factorization.

208395009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92508 (or 92505 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 208395009 is about 14435.8930794045. The cubic root of 208395009 is about 592.8740446474.

The spelling of 208395009 in words is "two hundred eight million, three hundred ninety-five thousand, nine".