394971228 has 36 divisors (see below), whose sum is σ = 1035379800. Its totient is φ = 131656752.

The previous prime is 394971223. The next prime is 394971277. The reversal of 394971228 is 822179493.

394971228 is a `hidden beast` number, since 39 + 497 + 122 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 (394971223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202203 + ... + 204146.

It is an arithmetic number, because the mean of its divisors is an integer number (28760550).

Almost surely, 2^394971228 is an apocalyptic number.

It is an amenable number.

394971228 is an abundant number, since it is smaller than the sum of its proper divisors (640408572).

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

394971228 is a wasteful number, since it uses less digits than its factorization.

394971228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406368 (or 406354 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 394971228 is about 19873.8830629548. The cubic root of 394971228 is about 733.7055767639.

The spelling of 394971228 in words is "three hundred ninety-four million, nine hundred seventy-one thousand, two hundred twenty-eight".