394215389568 has 1536 divisors, whose sum is σ = 1619064115200. Its totient is φ = 92804382720.

The previous prime is 394215389563. The next prime is 394215389587. The reversal of 394215389568 is 865983512493.

394215389568 is a `hidden beast` number, since 3 + 9 + 4 + 2 + 1 + 538 + 95 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394215389563) 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 191 ways as a sum of consecutive naturals, for example, 1767781905 + ... + 1767782127.

It is an arithmetic number, because the mean of its divisors is an integer number (1054078200).

Almost surely, 2^394215389568 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 394215389568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809532057600).

394215389568 is an abundant number, since it is smaller than the sum of its proper divisors (1224848725632).

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

394215389568 is a wasteful number, since it uses less digits than its factorization.

394215389568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 332 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The spelling of 394215389568 in words is "three hundred ninety-four billion, two hundred fifteen million, three hundred eighty-nine thousand, five hundred sixty-eight".