393985853 has 2 divisors, whose sum is σ = 393985854. Its totient is φ = 393985852.

The previous prime is 393985849. The next prime is 393985861. The reversal of 393985853 is 358589393.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208426969 + 185558884 = 14437^2 + 13622^2 .

It is a cyclic number.

It is not a de Polignac number, because 393985853 - 2² = 393985849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 393985795 and 393985804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393985873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196992926 + 196992927.

It is an arithmetic number, because the mean of its divisors is an integer number (196992927).

Almost surely, 2^393985853 is an apocalyptic number.

It is an amenable number.

393985853 is a deficient number, since it is larger than the sum of its proper divisors (1).

393985853 is an equidigital number, since it uses as much as digits as its factorization.

393985853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 53.

The square root of 393985853 is about 19849.0768802985. The cubic root of 393985853 is about 733.0949186175.

The spelling of 393985853 in words is "three hundred ninety-three million, nine hundred eighty-five thousand, eight hundred fifty-three".