17938556420 has 24 divisors (see below), whose sum is σ = 38023038144. Its totient is φ = 7108361696.

The previous prime is 17938556401. The next prime is 17938556443. The reversal of 17938556420 is 2465583971.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4189112 + ... + 4193391.

It is an arithmetic number, because the mean of its divisors is an integer number (1584293256).

It is a 1-persistent number, because it is pandigital, but 2⋅17938556420 = 35877112840 is not.

Almost surely, 2^17938556420 is an apocalyptic number.

17938556420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17938556420 is an abundant number, since it is smaller than the sum of its proper divisors (20084481724).

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

17938556420 is a wasteful number, since it uses less digits than its factorization.

17938556420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8382619 (or 8382617 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 17938556420 in words is "seventeen billion, nine hundred thirty-eight million, five hundred fifty-six thousand, four hundred twenty".