391779964889824 has 192 divisors, whose sum is σ = 929893888143360. Its totient is φ = 158727101091840.

The previous prime is 391779964889821. The next prime is 391779964889921. The reversal of 391779964889824 is 428988469977193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391779964889821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3750007252 + ... + 3750111724.

It is an arithmetic number, because the mean of its divisors is an integer number (4843197334080).

Almost surely, 2^{391779964889824} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391779964889824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464946944071680).

391779964889824 is an abundant number, since it is smaller than the sum of its proper divisors (538113923253536).

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

391779964889824 is a wasteful number, since it uses less digits than its factorization.

391779964889824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106393 (or 106385 counting only the distinct ones).

The product of its digits is 94810963968, while the sum is 94.

The spelling of 391779964889824 in words is "three hundred ninety-one trillion, seven hundred seventy-nine billion, nine hundred sixty-four million, eight hundred eighty-nine thousand, eight hundred twenty-four".