209716240739404 has 144 divisors (see below), whose sum is σ = 430842779136000. Its totient is φ = 89057166992640.

The previous prime is 209716240739363. The next prime is 209716240739407. The reversal of 209716240739404 is 404937042617902.

It is a happy number.

209716240739404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (209716240739407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12460109269 + ... + 12460126099.

It is an arithmetic number, because the mean of its divisors is an integer number (2991963744000).

Almost surely, 2^{209716240739404} 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 209716240739404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215421389568000).

209716240739404 is an abundant number, since it is smaller than the sum of its proper divisors (221126538396596).

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

209716240739404 is a wasteful number, since it uses less digits than its factorization.

209716240739404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18276 (or 18267 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 58.

The spelling of 209716240739404 in words is "two hundred nine trillion, seven hundred sixteen billion, two hundred forty million, seven hundred thirty-nine thousand, four hundred four".