399853 has 2 divisors, whose sum is σ = 399854. Its totient is φ = 399852.

The previous prime is 399851. The next prime is 399871. The reversal of 399853 is 358993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393129 + 6724 = 627^2 + 82^2 .

It is an emirp because it is prime and its reverse (358993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399853 - 2¹ = 399851 is a prime.

Together with 399851, it forms a pair of twin primes.

399853 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199926 + 199927.

It is an arithmetic number, because the mean of its divisors is an integer number (199927).

2³⁹⁹⁸⁵³ is an apocalyptic number.

It is an amenable number.

399853 is a deficient number, since it is larger than the sum of its proper divisors (1).

399853 is an equidigital number, since it uses as much as digits as its factorization.

399853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 399853 is about 632.3393076506. The cubic root of 399853 is about 73.6716029897.

It can be divided in two parts, 3 and 99853, that added together give a square (99856 = 316²).

The spelling of 399853 in words is "three hundred ninety-nine thousand, eight hundred fifty-three".