209839347140 has 24 divisors (see below), whose sum is σ = 440680110360. Its totient is φ = 83932409088.

The previous prime is 209839347121. The next prime is 209839347143. The reversal of 209839347140 is 41743938902.

209839347140 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 4 ways, for example, as 3812321536 + 206027025604 = 61744^2 + 453902^2 .

It is not an unprimeable number, because it can be changed into a prime (209839347143) 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 7 ways as a sum of consecutive naturals, for example, 344426 + ... + 733694.

It is an arithmetic number, because the mean of its divisors is an integer number (18361671265).

Almost surely, 2^209839347140 is an apocalyptic number.

209839347140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209839347140 is an abundant number, since it is smaller than the sum of its proper divisors (230840763220).

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

209839347140 is a wasteful number, since it uses less digits than its factorization.

209839347140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416231 (or 416229 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 209839347140 in words is "two hundred nine billion, eight hundred thirty-nine million, three hundred forty-seven thousand, one hundred forty".