394381428 has 96 divisors (see below), whose sum is σ = 1079930880. Its totient is φ = 109697280.

The previous prime is 394381399. The next prime is 394381439. The reversal of 394381428 is 824183493.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 394381428.

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 31 ways as a sum of consecutive naturals, for example, 530425 + ... + 531167.

It is an arithmetic number, because the mean of its divisors is an integer number (11249280).

Almost surely, 2^394381428 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 394381428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (539965440).

394381428 is an abundant number, since it is smaller than the sum of its proper divisors (685549452).

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

394381428 is a wasteful number, since it uses less digits than its factorization.

394381428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 394381428 is about 19859.0389495564. The cubic root of 394381428 is about 733.3401871719.

The spelling of 394381428 in words is "three hundred ninety-four million, three hundred eighty-one thousand, four hundred twenty-eight".