394131228 has 24 divisors (see below), whose sum is σ = 951352080. Its totient is φ = 126846720.

The previous prime is 394131203. The next prime is 394131239. The reversal of 394131228 is 822131493.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 565933 + ... + 566628.

It is an arithmetic number, because the mean of its divisors is an integer number (39639670).

Almost surely, 2^394131228 is an apocalyptic number.

It is an amenable number.

394131228 is an abundant number, since it is smaller than the sum of its proper divisors (557220852).

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

394131228 is a wasteful number, since it uses less digits than its factorization.

394131228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132597 (or 1132595 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 394131228 is about 19852.7385516457. The cubic root of 394131228 is about 733.1850746198.

The spelling of 394131228 in words is "three hundred ninety-four million, one hundred thirty-one thousand, two hundred twenty-eight".