209494830 has 64 divisors (see below), whose sum is σ = 518446656. Its totient is φ = 54144000.

The previous prime is 209494829. The next prime is 209494841. The reversal of 209494830 is 38494902.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222160 + ... + 223100.

It is an arithmetic number, because the mean of its divisors is an integer number (8100729).

Almost surely, 2^209494830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209494830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259223328).

209494830 is an abundant number, since it is smaller than the sum of its proper divisors (308951826).

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

209494830 is a wasteful number, since it uses less digits than its factorization.

209494830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 209494830 is about 14473.9362303418. The cubic root of 209494830 is about 593.9151949580.

The spelling of 209494830 in words is "two hundred nine million, four hundred ninety-four thousand, eight hundred thirty".