209361836394 has 12 divisors (see below), whose sum is σ = 453617312226. Its totient is φ = 69787278792.

The previous prime is 209361836393. The next prime is 209361836441. The reversal of 209361836394 is 493638163902.

209361836394 is a `hidden beast` number, since 209 + 3 + 6 + 18 + 36 + 394 = 666.

209361836394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 116953740225 + 92408096169 = 341985^2 + 303987^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 209361836394.

It is not an unprimeable number, because it can be changed into a prime (209361836393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5815606549 + ... + 5815606584.

Almost surely, 2^209361836394 is an apocalyptic number.

209361836394 is an abundant number, since it is smaller than the sum of its proper divisors (244255475832).

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

209361836394 is a wasteful number, since it uses less digits than its factorization.

209361836394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11631213141 (or 11631213138 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 54.

The spelling of 209361836394 in words is "two hundred nine billion, three hundred sixty-one million, eight hundred thirty-six thousand, three hundred ninety-four".