394747666080 has 384 divisors, whose sum is σ = 1321557866496. Its totient is φ = 98869248000.

The previous prime is 394747666067. The next prime is 394747666081. The reversal of 394747666080 is 80666747493.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (394747666081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 330885964 + ... + 330887156.

It is an arithmetic number, because the mean of its divisors is an integer number (3441556944).

Almost surely, 2^394747666080 is an apocalyptic number.

394747666080 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 394747666080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (660778933248).

394747666080 is an abundant number, since it is smaller than the sum of its proper divisors (926810200416).

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

394747666080 is a wasteful number, since it uses less digits than its factorization.

394747666080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 1872 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 60.

The spelling of 394747666080 in words is "three hundred ninety-four billion, seven hundred forty-seven million, six hundred sixty-six thousand, eighty".