209334728 has 16 divisors (see below), whose sum is σ = 396314880. Its totient is φ = 103650768.

The previous prime is 209334709. The next prime is 209334739. The reversal of 209334728 is 827433902.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 209334691 and 209334700.

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, 126200 + ... + 127847.

It is an arithmetic number, because the mean of its divisors is an integer number (24769680).

Almost surely, 2^209334728 is an apocalyptic number.

It is an amenable number.

209334728 is a deficient number, since it is larger than the sum of its proper divisors (186980152).

209334728 is a wasteful number, since it uses less digits than its factorization.

209334728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254156 (or 254152 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 209334728 is about 14468.4044731961. The cubic root of 209334728 is about 593.7638606847.

The spelling of 209334728 in words is "two hundred nine million, three hundred thirty-four thousand, seven hundred twenty-eight".