394261728 has 96 divisors (see below), whose sum is σ = 1223631360. Its totient is φ = 108756480.

The previous prime is 394261687. The next prime is 394261771. The reversal of 394261728 is 827162493.

It is a tau number, because it is divible by the number of its divisors (96).

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 394261728.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9373 + ... + 29603.

It is an arithmetic number, because the mean of its divisors is an integer number (12746160).

Almost surely, 2^394261728 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 394261728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611815680).

394261728 is an abundant number, since it is smaller than the sum of its proper divisors (829369632).

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

394261728 is a wasteful number, since it uses less digits than its factorization.

394261728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20280 (or 20272 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 394261728 is about 19856.0249798392. The cubic root of 394261728 is about 733.2659868365.

The spelling of 394261728 in words is "three hundred ninety-four million, two hundred sixty-one thousand, seven hundred twenty-eight".