19938438586378 has 32 divisors (see below), whose sum is σ = 32344381641600. Its totient is φ = 9163542288576.

The previous prime is 19938438586337. The next prime is 19938438586453. The reversal of 19938438586378 is 87368583483991.

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, 4162203 + ... + 7563121.

It is an arithmetic number, because the mean of its divisors is an integer number (1010761926300).

Almost surely, 2^{19938438586378} is an apocalyptic number.

19938438586378 is a deficient number, since it is larger than the sum of its proper divisors (12405943055222).

19938438586378 is a wasteful number, since it uses less digits than its factorization.

19938438586378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401886.

The product of its digits is 7524679680, while the sum is 82.

The spelling of 19938438586378 in words is "nineteen trillion, nine hundred thirty-eight billion, four hundred thirty-eight million, five hundred eighty-six thousand, three hundred seventy-eight".