399911 has 2 divisors, whose sum is σ = 399912. Its totient is φ = 399910.

The previous prime is 399899. The next prime is 399913. The reversal of 399911 is 119993.

It is a strong prime.

It is an emirp because it is prime and its reverse (119993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399911 - 2¹⁰ = 398887 is a prime.

Together with 399913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 399911.

It is not a weakly prime, because it can be changed into another prime (399913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199955 + 199956.

It is an arithmetic number, because the mean of its divisors is an integer number (199956).

2³⁹⁹⁹¹¹ is an apocalyptic number.

399911 is a deficient number, since it is larger than the sum of its proper divisors (1).

399911 is an equidigital number, since it uses as much as digits as its factorization.

399911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 32.

The square root of 399911 is about 632.3851674415. The cubic root of 399911 is about 73.6751649207.

The spelling of 399911 in words is "three hundred ninety-nine thousand, nine hundred eleven".