394171128 has 48 divisors (see below), whose sum is σ = 1149668520. Its totient is φ = 121283136.

The previous prime is 394171111. The next prime is 394171133. The reversal of 394171128 is 821171493.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 394171092 and 394171101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209626 + ... + 211497.

Almost surely, 2^394171128 is an apocalyptic number.

It is an amenable number.

394171128 is an abundant number, since it is smaller than the sum of its proper divisors (755497392).

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

394171128 is a wasteful number, since it uses less digits than its factorization.

394171128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421148 (or 421141 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 394171128 is about 19853.7434253594. The cubic root of 394171128 is about 733.2098151929.

The spelling of 394171128 in words is "three hundred ninety-four million, one hundred seventy-one thousand, one hundred twenty-eight".