390401663778 has 24 divisors (see below), whose sum is σ = 966708882048. Its totient is φ = 111543332472.

The previous prime is 390401663777. The next prime is 390401663783. The reversal of 390401663778 is 877366104093.

It is not an unprimeable number, because it can be changed into a prime (390401663777) by changing a digit.

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, 1549212826 + ... + 1549213077.

It is an arithmetic number, because the mean of its divisors is an integer number (40279536752).

Almost surely, 2^390401663778 is an apocalyptic number.

390401663778 is an abundant number, since it is smaller than the sum of its proper divisors (576307218270).

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

390401663778 is a wasteful number, since it uses less digits than its factorization.

390401663778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098425918 (or 3098425915 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 390401663778 in words is "three hundred ninety billion, four hundred one million, six hundred sixty-three thousand, seven hundred seventy-eight".