209305136 has 20 divisors (see below), whose sum is σ = 406921872. Its totient is φ = 104293056.

The previous prime is 209305099. The next prime is 209305153. The reversal of 209305136 is 631503902.

209305136 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×209305136³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209305099 and 209305108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17636 + ... + 27011.

Almost surely, 2^209305136 is an apocalyptic number.

It is an amenable number.

209305136 is a deficient number, since it is larger than the sum of its proper divisors (197616736).

209305136 is a wasteful number, since it uses less digits than its factorization.

209305136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44948 (or 44942 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 209305136 is about 14467.3817949206. The cubic root of 209305136 is about 593.7358807944.

The spelling of 209305136 in words is "two hundred nine million, three hundred five thousand, one hundred thirty-six".