9983827878438 has 32 divisors (see below), whose sum is σ = 20443866223104. Its totient is φ = 3248930928672.

The previous prime is 9983827878421. The next prime is 9983827878457. The reversal of 9983827878438 is 8348787283899.

It is a super-2 number, since 2×9983827878438² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44477020 + ... + 44700927.

It is an arithmetic number, because the mean of its divisors is an integer number (638870819472).

Almost surely, 2^{9983827878438} is an apocalyptic number.

9983827878438 is an abundant number, since it is smaller than the sum of its proper divisors (10460038344666).

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

9983827878438 is a wasteful number, since it uses less digits than its factorization.

9983827878438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89178396.

The product of its digits is 9364045824, while the sum is 84.

The spelling of 9983827878438 in words is "nine trillion, nine hundred eighty-three billion, eight hundred twenty-seven million, eight hundred seventy-eight thousand, four hundred thirty-eight".