209030928 has 20 divisors (see below), whose sum is σ = 539996688. Its totient is φ = 69676960.

The previous prime is 209030911. The next prime is 209030933. The reversal of 209030928 is 829030902.

Added to its reverse (829030902) it gives a triangular number (1038061830 = T₄₅₅₆₄).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2177358 + ... + 2177453.

Almost surely, 2^209030928 is an apocalyptic number.

It is an amenable number.

209030928 is an abundant number, since it is smaller than the sum of its proper divisors (330965760).

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

209030928 is a wasteful number, since it uses less digits than its factorization.

209030928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354822 (or 4354816 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 209030928 is about 14457.9019224782. The cubic root of 209030928 is about 593.4764855394.

Adding to 209030928 its reverse (829030902), we get a triangular number (1038061830 = T₄₅₅₆₄).

The spelling of 209030928 in words is "two hundred nine million, thirty thousand, nine hundred twenty-eight".