3978813991292 has 48 divisors (see below), whose sum is σ = 8127616293888. Its totient is φ = 1668785976000.

The previous prime is 3978813991213. The next prime is 3978813991303. The reversal of 3978813991292 is 2921993188793.

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, 16510667 + ... + 16749917.

It is an arithmetic number, because the mean of its divisors is an integer number (169325339456).

Almost surely, 2^{3978813991292} is an apocalyptic number.

It is an amenable number.

3978813991292 is an abundant number, since it is smaller than the sum of its proper divisors (4148802302596).

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

3978813991292 is a wasteful number, since it uses less digits than its factorization.

3978813991292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251946 (or 251944 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 71.

The spelling of 3978813991292 in words is "three trillion, nine hundred seventy-eight billion, eight hundred thirteen million, nine hundred ninety-one thousand, two hundred ninety-two".