394644779208 has 160 divisors (see below), whose sum is σ = 1119556468800. Its totient is φ = 129862541952.

The previous prime is 394644779201. The next prime is 394644779213. The reversal of 394644779208 is 802977446493.

394644779208 is a `hidden beast` number, since 39 + 46 + 4 + 477 + 92 + 0 + 8 = 666.

It is a super-2 number, since 2×394644779208² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394644779201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 106113973 + ... + 106117691.

It is an arithmetic number, because the mean of its divisors is an integer number (6997227930).

Almost surely, 2^394644779208 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 394644779208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559778234400).

394644779208 is an abundant number, since it is smaller than the sum of its proper divisors (724911689592).

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

394644779208 is a wasteful number, since it uses less digits than its factorization.

394644779208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793 (or 5780 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

The spelling of 394644779208 in words is "three hundred ninety-four billion, six hundred forty-four million, seven hundred seventy-nine thousand, two hundred eight".