391779964889922 has 64 divisors (see below), whose sum is σ = 904180848899328. Its totient is φ = 110856791808000.

The previous prime is 391779964889921. The next prime is 391779964889947. The reversal of 391779964889922 is 229988469977193.

It is not an unprimeable number, because it can be changed into a prime (391779964889921) 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, 105089979 + ... + 108754142.

It is an arithmetic number, because the mean of its divisors is an integer number (14127825764052).

Almost surely, 2^{391779964889922} is an apocalyptic number.

391779964889922 is an abundant number, since it is smaller than the sum of its proper divisors (512400884009406).

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

391779964889922 is a wasteful number, since it uses less digits than its factorization.

391779964889922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213844555.

The product of its digits is 53331167232, while the sum is 93.

The spelling of 391779964889922 in words is "three hundred ninety-one trillion, seven hundred seventy-nine billion, nine hundred sixty-four million, eight hundred eighty-nine thousand, nine hundred twenty-two".