209869393812 has 96 divisors (see below), whose sum is σ = 529943100288. Its totient is φ = 64260048384.

The previous prime is 209869393807. The next prime is 209869393813. The reversal of 209869393812 is 218393968902.

209869393812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209869393813) 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 31 ways as a sum of consecutive naturals, for example, 37655458 + ... + 37661030.

It is an arithmetic number, because the mean of its divisors is an integer number (5520240628).

Almost surely, 2^209869393812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209869393812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264971550144).

209869393812 is an abundant number, since it is smaller than the sum of its proper divisors (320073706476).

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

209869393812 is a wasteful number, since it uses less digits than its factorization.

209869393812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6729 (or 6727 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 209869393812 in words is "two hundred nine billion, eight hundred sixty-nine million, three hundred ninety-three thousand, eight hundred twelve".