394481628 has 18 divisors (see below), whose sum is σ = 997161984. Its totient is φ = 131493864.

The previous prime is 394481627. The next prime is 394481687. The reversal of 394481628 is 826184493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394481627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5478876 + ... + 5478947.

It is an arithmetic number, because the mean of its divisors is an integer number (55397888).

Almost surely, 2^394481628 is an apocalyptic number.

It is an amenable number.

394481628 is an abundant number, since it is smaller than the sum of its proper divisors (602680356).

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

394481628 is a wasteful number, since it uses less digits than its factorization.

394481628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10957833 (or 10957828 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 394481628 is about 19861.5615700277. The cubic root of 394481628 is about 733.4022881900.

The spelling of 394481628 in words is "three hundred ninety-four million, four hundred eighty-one thousand, six hundred twenty-eight".