394379880 has 64 divisors (see below), whose sum is σ = 1186833600. Its totient is φ = 104839680.

The previous prime is 394379813. The next prime is 394379897. The reversal of 394379880 is 88973493.

It is a Cunningham number, because it is equal to 19859²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34756 + ... + 44684.

It is an arithmetic number, because the mean of its divisors is an integer number (18544275).

Almost surely, 2^394379880 is an apocalyptic number.

394379880 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 394379880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (593416800).

394379880 is an abundant number, since it is smaller than the sum of its proper divisors (792453720).

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

394379880 is a wasteful number, since it uses less digits than its factorization.

394379880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10274 (or 10270 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The square root of 394379880 is about 19858.9999748225. Note that the first 4 decimals coincide. The cubic root of 394379880 is about 733.3392276845.

The spelling of 394379880 in words is "three hundred ninety-four million, three hundred seventy-nine thousand, eight hundred eighty".