394331880 has 128 divisors (see below), whose sum is σ = 1219276800. Its totient is φ = 101974272.

The previous prime is 394331863. The next prime is 394331893. The reversal of 394331880 is 88133493.

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, 783709 + ... + 784211.

It is an arithmetic number, because the mean of its divisors is an integer number (9525600).

Almost surely, 2^394331880 is an apocalyptic number.

394331880 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 394331880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (609638400).

394331880 is an abundant number, since it is smaller than the sum of its proper divisors (824944920).

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

394331880 is a wasteful number, since it uses less digits than its factorization.

394331880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 394331880 is about 19857.7914179800. The cubic root of 394331880 is about 733.3094748895.

The spelling of 394331880 in words is "three hundred ninety-four million, three hundred thirty-one thousand, eight hundred eighty".