394645872 has 80 divisors (see below), whose sum is σ = 1056852992. Its totient is φ = 126766080.

The previous prime is 394645861. The next prime is 394645907. The reversal of 394645872 is 278546493.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 501063 + ... + 501849.

Almost surely, 2^394645872 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 394645872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (528426496).

394645872 is an abundant number, since it is smaller than the sum of its proper divisors (662207120).

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

394645872 is a wasteful number, since it uses less digits than its factorization.

394645872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1160 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 394645872 is about 19865.6958599491. The cubic root of 394645872 is about 733.5040590569.

The spelling of 394645872 in words is "three hundred ninety-four million, six hundred forty-five thousand, eight hundred seventy-two".