209389050 has 240 divisors, whose sum is σ = 648442872. Its totient is φ = 49766400.

The previous prime is 209389013. The next prime is 209389057. The reversal of 209389050 is 50983902.

It can be written as a sum of positive squares in 12 ways, for example, as 13024881 + 196364169 = 3609^2 + 14013^2 .

It is a junction number, because it is equal to n+sod(n) for n = 209388996 and 209389014.

It is not an unprimeable number, because it can be changed into a prime (209389057) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2158602 + ... + 2158698.

Almost surely, 2^209389050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209389050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324221436).

209389050 is an abundant number, since it is smaller than the sum of its proper divisors (439053822).

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

209389050 is a wasteful number, since it uses less digits than its factorization.

209389050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 209389050 is about 14470.2816143985. The cubic root of 209389050 is about 593.8152164745.

The spelling of 209389050 in words is "two hundred nine million, three hundred eighty-nine thousand, fifty".