394704793251840 has 416 divisors, whose sum is σ = 1277402761229760. Its totient is φ = 104052814774272.

The previous prime is 394704793251809. The next prime is 394704793251863. The reversal of 394704793251840 is 48152397407493.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1900173906 + ... + 1900381614.

Almost surely, 2^{394704793251840} is an apocalyptic number.

394704793251840 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 394704793251840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638701380614880).

394704793251840 is an abundant number, since it is smaller than the sum of its proper divisors (882697967977920).

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

394704793251840 is a wasteful number, since it uses less digits than its factorization.

394704793251840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208095 (or 208073 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 66.

The spelling of 394704793251840 in words is "three hundred ninety-four trillion, seven hundred four billion, seven hundred ninety-three million, two hundred fifty-one thousand, eight hundred forty".