209928930 has 16 divisors (see below), whose sum is σ = 503829504. Its totient is φ = 55981040.

The previous prime is 209928923. The next prime is 209928949. The reversal of 209928930 is 39829902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3498786 + ... + 3498845.

It is an arithmetic number, because the mean of its divisors is an integer number (31489344).

Almost surely, 2^209928930 is an apocalyptic number.

209928930 is an abundant number, since it is smaller than the sum of its proper divisors (293900574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209928930 is a wasteful number, since it uses less digits than its factorization.

209928930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997641.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 209928930 is about 14488.9243907200. The cubic root of 209928930 is about 594.3251346102.

The spelling of 209928930 in words is "two hundred nine million, nine hundred twenty-eight thousand, nine hundred thirty".