9985821738 has 32 divisors (see below), whose sum is σ = 20520262656. Its totient is φ = 3237248448.

The previous prime is 9985821731. The next prime is 9985821739. The reversal of 9985821738 is 8371285899.

It is a super-2 number, since 2×9985821738² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9985821731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589495 + ... + 606197.

It is an arithmetic number, because the mean of its divisors is an integer number (641258208).

Almost surely, 2^9985821738 is an apocalyptic number.

9985821738 is an abundant number, since it is smaller than the sum of its proper divisors (10534440918).

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

9985821738 is a wasteful number, since it uses less digits than its factorization.

9985821738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19438.

The product of its digits is 8709120, while the sum is 60.

The square root of 9985821738 is about 99929.0835442815. The cubic root of 9985821738 is about 2153.4160037902.

The spelling of 9985821738 in words is "nine billion, nine hundred eighty-five million, eight hundred twenty-one thousand, seven hundred thirty-eight".