399123 has 12 divisors (see below), whose sum is σ = 586768. Its totient is φ = 261360.

The previous prime is 399107. The next prime is 399131. The reversal of 399123 is 321993.

It is not a de Polignac number, because 399123 - 2⁴ = 399107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186 + ... + 912.

2³⁹⁹¹²³ is an apocalyptic number.

399123 is a deficient number, since it is larger than the sum of its proper divisors (187645).

399123 is a wasteful number, since it uses less digits than its factorization.

399123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 791 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 399123 is about 631.7618222083. The cubic root of 399123 is about 73.6267423103.

The spelling of 399123 in words is "three hundred ninety-nine thousand, one hundred twenty-three".