39781838181996 has 120 divisors (see below), whose sum is σ = 105349304639040. Its totient is φ = 13088368800000.

The previous prime is 39781838181983. The next prime is 39781838182043. The reversal of 39781838181996 is 69918183818793.

39781838181996 is a `hidden beast` number, since 3 + 9 + 78 + 1 + 8 + 381 + 81 + 9 + 96 = 666.

39781838181996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 76554646 + ... + 77072546.

It is an arithmetic number, because the mean of its divisors is an integer number (877910871992).

Almost surely, 2^{39781838181996} is an apocalyptic number.

39781838181996 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39781838181996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52674652319520).

39781838181996 is an abundant number, since it is smaller than the sum of its proper divisors (65567466457044).

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

39781838181996 is a wasteful number, since it uses less digits than its factorization.

39781838181996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520997 (or 520986 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 81.

The spelling of 39781838181996 in words is "thirty-nine trillion, seven hundred eighty-one billion, eight hundred thirty-eight million, one hundred eighty-one thousand, nine hundred ninety-six".