399111 has 8 divisors (see below), whose sum is σ = 535920. Its totient is φ = 264192.

The previous prime is 399107. The next prime is 399131. The reversal of 399111 is 111993.

399111 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399111 - 2² = 399107 is a prime.

It is an Ulam number.

399111 is strictly pandigital in base 7.

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 399111.

It is not an unprimeable number, because it can be changed into a prime (399101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (66990).

2³⁹⁹¹¹¹ is an apocalyptic number.

399111 is a deficient number, since it is larger than the sum of its proper divisors (136809).

399111 is a wasteful number, since it uses less digits than its factorization.

399111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945.

The product of its digits is 243, while the sum is 24.

The square root of 399111 is about 631.7523248869. The cubic root of 399111 is about 73.6260044177.

The spelling of 399111 in words is "three hundred ninety-nine thousand, one hundred eleven".