209135930 has 16 divisors (see below), whose sum is σ = 380981664. Its totient is φ = 82646160.

The previous prime is 209135917. The next prime is 209135939. The reversal of 209135930 is 39531902.

It is not an unprimeable number, because it can be changed into a prime (209135939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125156 + ... + 126815.

It is an arithmetic number, because the mean of its divisors is an integer number (23811354).

Almost surely, 2^209135930 is an apocalyptic number.

209135930 is a deficient number, since it is larger than the sum of its proper divisors (171845734).

209135930 is a wasteful number, since it uses less digits than its factorization.

209135930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252061.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 209135930 is about 14461.5327680022. The cubic root of 209135930 is about 593.5758421068.

The spelling of 209135930 in words is "two hundred nine million, one hundred thirty-five thousand, nine hundred thirty".