399444853 has 2 divisors, whose sum is σ = 399444854. Its totient is φ = 399444852.

The previous prime is 399444833. The next prime is 399444893. The reversal of 399444853 is 358444993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259306609 + 140138244 = 16103^2 + 11838^2 .

It is an emirp because it is prime and its reverse (358444993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399444853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399444797 and 399444806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399444833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199722426 + 199722427.

It is an arithmetic number, because the mean of its divisors is an integer number (199722427).

Almost surely, 2^399444853 is an apocalyptic number.

It is an amenable number.

399444853 is a deficient number, since it is larger than the sum of its proper divisors (1).

399444853 is an equidigital number, since it uses as much as digits as its factorization.

399444853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 49.

The square root of 399444853 is about 19986.1165062150. The cubic root of 399444853 is about 736.4652787430.

The spelling of 399444853 in words is "three hundred ninety-nine million, four hundred forty-four thousand, eight hundred fifty-three".