209736119394 has 128 divisors (see below), whose sum is σ = 493637760000. Its totient is φ = 65825270784.

The previous prime is 209736119377. The next prime is 209736119423. The reversal of 209736119394 is 493911637902.

It is a happy number.

209736119394 is a `hidden beast` number, since 2 + 0 + 9 + 7 + 361 + 193 + 94 = 666.

209736119394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 209736119394.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 141426177 + ... + 141427659.

It is an arithmetic number, because the mean of its divisors is an integer number (3856545000).

Almost surely, 2^209736119394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209736119394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246818880000).

209736119394 is an abundant number, since it is smaller than the sum of its proper divisors (283901640606).

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

209736119394 is a wasteful number, since it uses less digits than its factorization.

209736119394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269 (or 2263 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The spelling of 209736119394 in words is "two hundred nine billion, seven hundred thirty-six million, one hundred nineteen thousand, three hundred ninety-four".