394706688 has 72 divisors (see below), whose sum is σ = 1070426448. Its totient is φ = 129073152.

The previous prime is 394706651. The next prime is 394706699. The reversal of 394706688 is 886607493.

It is a self number, because there is not a number n which added to its sum of digits gives 394706688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35856 + ... + 45552.

It is an arithmetic number, because the mean of its divisors is an integer number (14867034).

Almost surely, 2^394706688 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 394706688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535213224).

394706688 is an abundant number, since it is smaller than the sum of its proper divisors (675719760).

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

394706688 is an equidigital number, since it uses as much as digits as its factorization.

394706688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9769 (or 9755 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 394706688 is about 19867.2264798084. The cubic root of 394706688 is about 733.5417354437.

The spelling of 394706688 in words is "three hundred ninety-four million, seven hundred six thousand, six hundred eighty-eight".