394484336640 has 576 divisors, whose sum is σ = 1436118465600. Its totient is φ = 100007018496.

The previous prime is 394484336627. The next prime is 394484336651. The reversal of 394484336640 is 46633484493.

394484336640 is a `hidden beast` number, since 3 + 94 + 484 + 3 + 36 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179065779 + ... + 179067981.

It is an arithmetic number, because the mean of its divisors is an integer number (2493261225).

Almost surely, 2^394484336640 is an apocalyptic number.

394484336640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394484336640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718059232800).

394484336640 is an abundant number, since it is smaller than the sum of its proper divisors (1041634128960).

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

394484336640 is a wasteful number, since it uses less digits than its factorization.

394484336640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2309 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 54.

The spelling of 394484336640 in words is "three hundred ninety-four billion, four hundred eighty-four million, three hundred thirty-six thousand, six hundred forty".