393956 has 12 divisors (see below), whose sum is σ = 695100. Its totient is φ = 195360.

The previous prime is 393947. The next prime is 393961. The reversal of 393956 is 659393.

It can be written as a sum of positive squares in 2 ways, for example, as 173056 + 220900 = 416^2 + 470^2 .

It is an unprimeable number.

393956 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (57925).

2³⁹³⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

393956 is a deficient number, since it is larger than the sum of its proper divisors (301144).

393956 is a wasteful number, since it uses less digits than its factorization.

393956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 812 counting only the distinct ones).

The product of its digits is 21870, while the sum is 35.

The square root of 393956 is about 627.6591431661. The cubic root of 393956 is about 73.3076402187.

The spelling of 393956 in words is "three hundred ninety-three thousand, nine hundred fifty-six".