3938291880978 has 128 divisors (see below), whose sum is σ = 9712120449024. Its totient is φ = 1036758528000.

The previous prime is 3938291880937. The next prime is 3938291880983. The reversal of 3938291880978 is 8790881928393.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 820304178 + ... + 820308978.

It is an arithmetic number, because the mean of its divisors is an integer number (75875941008).

Almost surely, 2^{3938291880978} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3938291880978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4856060224512).

3938291880978 is an abundant number, since it is smaller than the sum of its proper divisors (5773828568046).

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

3938291880978 is a wasteful number, since it uses less digits than its factorization.

3938291880978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280.

The product of its (nonzero) digits is 376233984, while the sum is 75.

The spelling of 3938291880978 in words is "three trillion, nine hundred thirty-eight billion, two hundred ninety-one million, eight hundred eighty thousand, nine hundred seventy-eight".