399243 has 16 divisors (see below), whose sum is σ = 594720. Its totient is φ = 236544.

The previous prime is 399241. The next prime is 399263. The reversal of 399243 is 342993.

It is not a de Polignac number, because 399243 - 2¹ = 399241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399243.

It is not an unprimeable number, because it can be changed into a prime (399241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (37170).

2³⁹⁹²⁴³ is an apocalyptic number.

399243 is a deficient number, since it is larger than the sum of its proper divisors (195477).

399243 is a wasteful number, since it uses less digits than its factorization.

399243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398.

The product of its digits is 5832, while the sum is 30.

The square root of 399243 is about 631.8567875714. The cubic root of 399243 is about 73.6341204233.

The spelling of 399243 in words is "three hundred ninety-nine thousand, two hundred forty-three".