399983 has 2 divisors, whose sum is σ = 399984. Its totient is φ = 399982.

The previous prime is 399979. The next prime is 399989. The reversal of 399983 is 389993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399983 - 2² = 399979 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399989) 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, 199991 + 199992.

It is an arithmetic number, because the mean of its divisors is an integer number (199992).

2³⁹⁹⁹⁸³ is an apocalyptic number.

399983 is a deficient number, since it is larger than the sum of its proper divisors (1).

399983 is an equidigital number, since it uses as much as digits as its factorization.

399983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 41.

The square root of 399983 is about 632.4420922108. The cubic root of 399983 is about 73.6795861491.

The spelling of 399983 in words is "three hundred ninety-nine thousand, nine hundred eighty-three".