394128397380 has 24 divisors (see below), whose sum is σ = 1103559512832. Its totient is φ = 105100905952.

The previous prime is 394128397373. The next prime is 394128397427. The reversal of 394128397380 is 83793821493.

It is a self number, because there is not a number n which added to its sum of digits gives 394128397380.

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 7 ways as a sum of consecutive naturals, for example, 3284403252 + ... + 3284403371.

It is an arithmetic number, because the mean of its divisors is an integer number (45981646368).

Almost surely, 2^394128397380 is an apocalyptic number.

394128397380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394128397380 is an abundant number, since it is smaller than the sum of its proper divisors (709431115452).

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

394128397380 is a wasteful number, since it uses less digits than its factorization.

394128397380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568806635 (or 6568806633 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 394128397380 in words is "three hundred ninety-four billion, one hundred twenty-eight million, three hundred ninety-seven thousand, three hundred eighty".