394171680 has 144 divisors (see below), whose sum is σ = 1444443840. Its totient is φ = 90091008.

The previous prime is 394171651. The next prime is 394171697. The reversal of 394171680 is 86171493.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15141 + ... + 31899.

It is an arithmetic number, because the mean of its divisors is an integer number (10030860).

Almost surely, 2^394171680 is an apocalyptic number.

394171680 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 394171680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722221920).

394171680 is an abundant number, since it is smaller than the sum of its proper divisors (1050272160).

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

394171680 is a wasteful number, since it uses less digits than its factorization.

394171680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16791 (or 16776 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 394171680 is about 19853.7573270150. The cubic root of 394171680 is about 733.2101574568.

The spelling of 394171680 in words is "three hundred ninety-four million, one hundred seventy-one thousand, six hundred eighty".