394424128 has 84 divisors (see below), whose sum is σ = 942083460. Its totient is φ = 163172352.

The previous prime is 394424119. The next prime is 394424131. The reversal of 394424128 is 821424493.

It can be written as a sum of positive squares in 2 ways, for example, as 77299264 + 317124864 = 8792^2 + 17808^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 88776 + ... + 93112.

Almost surely, 2^394424128 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 394424128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471041730).

394424128 is an abundant number, since it is smaller than the sum of its proper divisors (547659332).

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

394424128 is a wasteful number, since it uses less digits than its factorization.

394424128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4392 (or 4375 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 394424128 is about 19860.1139976587. The cubic root of 394424128 is about 733.3666526642.

The spelling of 394424128 in words is "three hundred ninety-four million, four hundred twenty-four thousand, one hundred twenty-eight".