394191306 has 64 divisors (see below), whose sum is σ = 891158400. Its totient is φ = 129143808.

The previous prime is 394191293. The next prime is 394191311. The reversal of 394191306 is 603191493.

It is a Curzon number.

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, 1135825 + ... + 1136171.

It is an arithmetic number, because the mean of its divisors is an integer number (13924350).

Almost surely, 2^394191306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394191306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445579200).

394191306 is an abundant number, since it is smaller than the sum of its proper divisors (496967094).

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

394191306 is a wasteful number, since it uses less digits than its factorization.

394191306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 394191306 is about 19854.2515849880. The cubic root of 394191306 is about 733.2223262185. Note that the first 3 decimals are identical.

The spelling of 394191306 in words is "three hundred ninety-four million, one hundred ninety-one thousand, three hundred six".