209718384988 has 12 divisors (see below), whose sum is σ = 419436770032. Its totient is φ = 89879307840.

The previous prime is 209718384917. The next prime is 209718385039. The reversal of 209718384988 is 889483817902.

209718384988 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3744971133 + ... + 3744971188.

Almost surely, 2^209718384988 is an apocalyptic number.

209718384988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209718384988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

209718384988 is a wasteful number, since it uses less digits than its factorization.

209718384988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7489942332 (or 7489942330 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 67.

The spelling of 209718384988 in words is "two hundred nine billion, seven hundred eighteen million, three hundred eighty-four thousand, nine hundred eighty-eight".