394389252 has 18 divisors (see below), whose sum is σ = 996928478. Its totient is φ = 131463072.

The previous prime is 394389187. The next prime is 394389283. The reversal of 394389252 is 252983493.

It is a happy number.

394389252 is a `hidden beast` number, since 394 + 3 + 8 + 9 + 252 = 666.

It can be written as a sum of positive squares in only one way, i.e., 394181316 + 207936 = 19854^2 + 456^2 .

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

It is a super-3 number, since 3×394389252³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 394389198 and 394389207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5477593 + ... + 5477664.

Almost surely, 2^394389252 is an apocalyptic number.

It is an amenable number.

394389252 is an abundant number, since it is smaller than the sum of its proper divisors (602539226).

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

394389252 is a wasteful number, since it uses less digits than its factorization.

394389252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10955267 (or 10955262 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 394389252 is about 19859.2359369639. The cubic root of 394389252 is about 733.3450366360.

The spelling of 394389252 in words is "three hundred ninety-four million, three hundred eighty-nine thousand, two hundred fifty-two".