1978943173120 has 40 divisors (see below), whose sum is σ = 4744825473564. Its totient is φ = 791577268224.

The previous prime is 1978943173117. The next prime is 1978943173237. The reversal of 1978943173120 is 213713498791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1968117186816 + 10825986304 = 1402896^2 + 104048^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386509779 + ... + 386514898.

Almost surely, 2^{1978943173120} is an apocalyptic number.

1978943173120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978943173120 is an abundant number, since it is smaller than the sum of its proper divisors (2765882300444).

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

1978943173120 is an frugal number, since it uses more digits than its factorization.

1978943173120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773024700 (or 773024684 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 1978943173120 in words is "one trillion, nine hundred seventy-eight billion, nine hundred forty-three million, one hundred seventy-three thousand, one hundred twenty".