394923564 has 72 divisors (see below), whose sum is σ = 1162455840. Its totient is φ = 110702592.

The previous prime is 394923517. The next prime is 394923623. The reversal of 394923564 is 465329493.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1429 + ... + 28140.

It is an arithmetic number, because the mean of its divisors is an integer number (16145220).

Almost surely, 2^394923564 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 394923564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (581227920).

394923564 is an abundant number, since it is smaller than the sum of its proper divisors (767532276).

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

394923564 is a wasteful number, since it uses less digits than its factorization.

394923564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29639 (or 29634 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 394923564 is about 19872.6838650445. The cubic root of 394923564 is about 733.6760617453.

The spelling of 394923564 in words is "three hundred ninety-four million, nine hundred twenty-three thousand, five hundred sixty-four".