394307816 has 64 divisors (see below), whose sum is σ = 886464000. Its totient is φ = 160883712.

The previous prime is 394307803. The next prime is 394307831. The reversal of 394307816 is 618703493.

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, 95360 + ... + 99408.

It is an arithmetic number, because the mean of its divisors is an integer number (13851000).

Almost surely, 2^394307816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394307816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443232000).

394307816 is an abundant number, since it is smaller than the sum of its proper divisors (492156184).

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

394307816 is a wasteful number, since it uses less digits than its factorization.

394307816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4146 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 394307816 is about 19857.1855004681. The cubic root of 394307816 is about 733.2945579130.

The spelling of 394307816 in words is "three hundred ninety-four million, three hundred seven thousand, eight hundred sixteen".