399042 has 24 divisors (see below), whose sum is σ = 988416. Its totient is φ = 113976.

The previous prime is 399031. The next prime is 399043. The reversal of 399042 is 240993.

It is a junction number, because it is equal to n+sod(n) for n = 398997 and 399015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399043) by changing a digit.

399042 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1458 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (41184).

2³⁹⁹⁰⁴² is an apocalyptic number.

399042 is an abundant number, since it is smaller than the sum of its proper divisors (589374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399042 is a wasteful number, since it uses less digits than its factorization.

399042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182 (or 3179 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 399042 is about 631.6977125176. The cubic root of 399042 is about 73.6217612480.

The spelling of 399042 in words is "three hundred ninety-nine thousand, forty-two".