394057128 has 32 divisors (see below), whose sum is σ = 986083200. Its totient is φ = 131227008.

The previous prime is 394057123. The next prime is 394057163. The reversal of 394057128 is 821750493.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (394057121) 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 7 ways as a sum of consecutive naturals, for example, 19825 + ... + 34367.

It is an arithmetic number, because the mean of its divisors is an integer number (30815100).

Almost surely, 2^394057128 is an apocalyptic number.

It is an amenable number.

394057128 is an abundant number, since it is smaller than the sum of its proper divisors (592026072).

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

394057128 is a wasteful number, since it uses less digits than its factorization.

394057128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15681 (or 15677 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 394057128 is about 19850.8722226506. The cubic root of 394057128 is about 733.1391234109.

The spelling of 394057128 in words is "three hundred ninety-four million, fifty-seven thousand, one hundred twenty-eight".