3878914921920 has 84 divisors (see below), whose sum is σ = 13341851126760. Its totient is φ = 1034377311744.

The previous prime is 3878914921913. The next prime is 3878914921939. The reversal of 3878914921920 is 291294198783.

3878914921920 is a `hidden beast` number, since 38 + 7 + 8 + 91 + 492 + 1 + 9 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 673419850 + ... + 673425609.

Almost surely, 2^{3878914921920} is an apocalyptic number.

3878914921920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3878914921920 is an abundant number, since it is smaller than the sum of its proper divisors (9462936204840).

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

3878914921920 is a wasteful number, since it uses less digits than its factorization.

3878914921920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346845482 (or 1346845469 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 3878914921920 in words is "three trillion, eight hundred seventy-eight billion, nine hundred fourteen million, nine hundred twenty-one thousand, nine hundred twenty".